Using a UML Use Case Diagram, you can't. You can describe those details in other UML diagram types and documents, and have them be linked from use cases. Use case diagrams model the functionality of a system using actors and use cases. Creately diagrams can be exported and added to Word, PPT (powerpoint), Excel, Visio or any other document. Everyone who has ever written functional specifications that consisted of We use cookies to offer you a better experience. The entire system can span all of these modules depicting the overall system boundary. The <> relationship is used to include common behavior from an included use case into a base use case in order to support the reuse of common behavior. If yours contain more than 20 use cases, you are probably misusing use case diagram. In this context, a "system" is something being … Use cases are represented with a labeled oval shape. Various actors in the below use case diagram are: User and System. can form a system boundary for use cases specific to each of these business functions. The tip of arrowhead points to the child use case and the parent use case connected at the base of the arrow. In particular, there are include and extend relationships among use cases. Use cases are a set of actions, services, and functions that the system needs to perform. The tip of the arrow is connected to the parent use case. Is use case diagram underrated? Use cases sequentialy related, how to deal with this? Such a use case could indeed be the detail of a single step of the main flow or the alternate flow of a sea level use case. So what is a use case diagram? The reuse of an existing use case by using different types of relationships reduces the overall effort required in developing a system. Use Case Descriptions • actors - something with a behavior or role, e.g., a person, another system, organization. • scenario - a specific sequence of actions and interactions between actors and the system, a.k.a. Actors may be connected to use cases by associations, indicating that the actor and the use case communicate with one another using messages. Are there any external events the system must know about? Generalization is shown as a directed arrow with a triangle arrowhead. The "Community detail" and "UML diagrams" columns introduce RM-ODP community concepts and associated UML notation. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Besides, there are associations that connect between actors and use cases. You are here: Home 1 / Uncategorized 2 / use case diagram levels. @Asperger Take the typical ATM example. No Ad, no limited number of shape and diagram. Achieving the right level of use case granularity eases communication between stakeholders and developers and improves project planning. The child use case is connected at the base of the arrow. Why does HTTPS not support non-repudiation? The Unified Modeling Language (UML) includes a use case diagram notation. Below are few ways to use them. • However, the UML defines a use case diagram to illustrate the names of use cases and actors, and their relationships As mentioned before use case diagrams are used to gather a usage requirement of a system. In this approach, use cases are structured at five levels, each identified in a row of Table 3.1-1 below. A use case diagram is usually simple. InfoART New. Do you mind also giving a small example of a subfunction used as part of a main flow? Software Engineering Stack Exchange is a question and answer site for professionals, academics, and students working within the systems development life cycle. The use case model also shows the use of extend and include. We will look into some specific purpose, which will distinguish it from other four diagrams.Use case diagrams are used to gather the requirements of a system including internal andexterna… Other requirements such as business rules, quality of service requirements, and implementation constraints must be represented separately, again, with other UML diagrams. The main use cases are in the system and the diagram illustrates on how the actors interact with the use cases.For eg. ive got 10 use cases at a high level these then split down in one instance to a manage record use case, then this splits to add, edit and delete. As you can see even a system as big as a vehicle sales system contains not more than 10 use cases! What is the bond energy of H-O? The figure below provides a use case example by showing two generalization connectors that connect between the three use cases. For what I've understood, Sea level use cases should document the following things: Use Case ID, Use Case, Actor, Trigger, Precondition, Postcondition, Main Flow, Alternative Flows, Exceptions. Use case diagram : distingishing the actor of a use case, Clean Architecture - Too many Use Case Classes, How to keep track of all functionality in a large application, Use case interactions in clean architecture, Clean Architecture: Use case spanning multiple UI elements. Main flow of the first one would be 1) authenticate 2) chose bank account 3) enter amount 4) confirm. You've learned what a Use Case Diagram is and how to draw a Use Case Diagram. Semi-feral cat broke a tooth. Is there any reason to use basic lands instead of basic snow-covered lands? System function (process - automated or manual). The child may add or override the behavior of the parent. This terminology was introduced by Alistair Cockburn in his book Writing effective use cases. use case diagram for kids game--You can edit this template and create your own diagram. rev 2020.12.18.38240, The best answers are voted up and rise to the top, Software Engineering Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. Wikipedia disagrees with itself. What functions will the actor want from the system? A uses relationship from base use case to child use case indicates that an instance of the base use case will include the behavior as specified in the child use case. Are you looking for a Free UML tool for learning UML faster, easier and quicker? The Document Management System (DMS) use case diagram example below shows the actors and use cases of the system. Only then can they be refined and detailed further. Use case decomposition for class registration system. the actors and the relationships between the actors and use cases. Making statements based on opinion; back them up with references or personal experience. The idea is that the sea level corresponds to the concrete goals of a business user in his everyday life. What actor informs the system of those events? Curerntly, I am documenting all the client's requirements using usecase diagrams and ofcourse I am new in design paradigm. Free Online Use Case Diagram Tool for drawing UML Use Case Diagram on the web. This is exactly what I needed to know! site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. Object-Oriented Software Engineering - A Use Case Driven Approach. Use Case Diagram Examples. Use cases are a powerful technique for exploring user requirements. The actors correspond approximately (exact… Use PDF export for high quality prints and SVG export for large sharp images or embed your diagrams anywhere with the Creately viewer. That's the beauty of use case modeling. The figure below shows an ATM use case diagram example, which is quite a classic example to use in teaching use case diagram. If you want to learn more about other UML diagram types, please check the UML guide: Overview of the 14 UML Diagram Types. When a use case is depicted as using the functionality of another use case, the relationship between the use cases is named as include or uses relationship. Always structure and organize the use case diagram from the perspective of actors. The <> relationship is used to include optional behavior from an extending use case in an extended use case. Use cases specify the expected behavior (what), and not the exact method of making it happen (how). These use cases don’t neccessarily have do with implementation (or software development) and are usually the topic of discussion at management meetings. Try the FREE web based Component Diagram tool. or simply, Why use cases?. Use Case Diagram For Clinic Management System Uploaded by admin on Sunday, November 1st, 2020 in category Diagram.. See also Healthcare Management System Database Project.Cis 9340 from Diagram Topic.. While a use case itself might drill into a lot of detail about every possibility, a use-case diagram is often used for a higher-level view of the system as blueprints. design the use case diagram, 3 levels of DFD and class diagram for airline reservation system. It is also used to draw diagrams of various types such as Entity Relationship diagrams, UML diagrams, Flowcharts, Network diagrams, etc. The purpose of use case diagram is to capture the dynamic aspect of a system. A use case diagram is a dynamic or behavior diagram in UML. Airport check-in and security screening business model. “This is not a use case” And you may have been told that this is how functional specifications are created in UML. For a high-level view of the system – Especially useful when presenting to managers or stakeholders. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Use cases are not object-oriented but are an integral part of the unified process. Use Case Diagrams • Use cases are text documents, not diagrams, and usecase modeling is primarily an act of writing text, not drawing. A use case refinement approach proposed by Cockburn and tailored for the purpose of the NCI was applied next (step 4). These days use case modeling is often associated with UML, although it has been introduced before UML existed. Asking for help, clarification, or responding to other answers. A generalization relationship means that a child use case inherits the behavior and meaning of the parent use case. Figure 2 shows a partial use case diagramfor our cafeteria ordering system. Kite level mentions the actor and some more specific cases. Multi-Wire Branch Circuit on wrong breakers. To identify functions and how roles interact with them – The primary purpose of use case diagrams. An include relationship is depicted with a directed arrow having a dotted line. The add has four or five use cases itself. Its brief history is as follow: Use case diagrams are typically developed in the early stage of development and people often apply use case modeling for the following purposes: A standard form of use case diagram is defined in the Unified Modeling Language as shown in the Use Case Diagram example below: Use cases share different kinds of relationships. For large and complex systems, each module may be the system boundary. I've found out that there are 5 use case levels: Level 0 Cloud; Level 1 Kite ; Level 2 Sea ; Level 3 Fish ; Level 4 Clam; Cloud level lists only high level users goals such as "Manage files". Use cases once specified can be denoted both textual and visual representation (i.e. Only then can they be refined and detailed further. A visual design tool to create eye-catching infographics, flyers and other visuals in minutes, with no design experience! Here we have another image Dbms Case Study featured under Use Case Diagram For Clinic Management SystemDbms Case Study featured under Use Case Diagram … Visual Paradigm Community Edition is a UML software that supports all UML diagram types. A use case scenario is a sequence of steps that represents a single use case execution (a scenario is a possible path through a use case specification). Use Case Levels of Details Is my LED driver fundamentally incorrect, or can I compensate it somehow? It is beneficial to write use cases at a coarser level of granularity with less detail when it's not required. The figure below shows the UML diagram hierarchy and the positioning of the UML Use Case Diagram. The child use case is an enhancement of the parent use case. Use cases at this level should not be defined as use cases, but rather appear as steps in another use case, most likely at fish level. Purpose: An example of a business use case diagram for airport check-in and security screening.. Summary: Business use cases are Individual Check-In, Group Check-In (for groups of tourists), Security Screening, etc. Use cases represent only the functional requirements of a system. To learn more, see our tips on writing great answers. Im having some trouble working out how far to go with my use case diagrams in the conceptual design part of the planning phase. Kite level mentions the actor and some more specific cases. The details could be user or system (e.g check bank server if amount is available) or both, How digital identity protects your software, Podcast 297: All Time Highs: Talking crypto with Li Ouyang. It's easy-to-use and intuitive. Each Actor must be linked to a use case, while some use cases may not be linked to actors. However, this definition is too generic to describe the purpose, as other four diagrams (activity, sequence, collaboration, and Statechart) also have the same purpose. The purpose of use case diagram is to capture the dynamic aspect of a system. At Cloud Level a use case represents ways of getting to goals, that are highly summarised, such as as ‘make money’. I hope you will find the answer when finished reading this article. Use cases should start off simple and at the highest view possible. Absolutely free! Alastair Cockburn in Writing Effective Use Cases gives us an easy way to visualize different levels of goal level by thinking in terms of the sea: I hope you can answer "what is use case diagram" now and can apply use case in your project. The use case diagrams identify all the actors in the problem domain, and a systems analyst can concentrate on what humans want and need to use the system, extend their capabilities, and enjoy their interaction with technology. Why Use case diagram? Applications New. extract data from file and manipulate content to write to new file, What expresses the efficiency of an algorithm when solving MILPs. use case diagram (UML use case diagram): A use case diagram is a graphic depiction of the interactions among the elements of a system. For example, for an ERP system for an organization, each of the modules such as personnel, payroll, accounting, etc. Would France and other EU countries have been able to block freight traffic from the UK if the UK was still in the EU? What is above the sea is high level (therefore the cloud and the kite). A key concept of use case modeling is that it helps us design a system from the end user's perspective. Does anything happen automatically at a present time? All rights reserved. You should use a Sequence Diagram or a traditional flow chart instead. Experts recommend that use case diagrams be used to supplement a more descriptive textual use case. Sea level use cases would be withdraw cash, deposit cash, transfer money. Expert Answer 100% (1 rating) Previous question Next question Get more help from Chegg. The include relationship adds additional functionality not specified in the base use case. How Do I Control the Onboard LEDs of My Arduino Nano 33 BLE Sense? Project-specific solution for exchanges detailed in use case level-3 (could be MSG, SOA, or both) 4 Use case relationships are listed as the following: A Use Case diagram illustrates a set of use cases for a system, i.e. The detailed requirements may then be captured in … Get Visual Paradigm Community Edition, a free UML software, and create your own Use Case Diagram with the free Use Case Diagram tool. A use case includes the functionality described in another use case as a part of its business process flow. 2. As you can see, use case diagrams belong to the family of behavioral diagrams. Here are some questions that have been asked frequently in the UML world are: What is a use case diagram? Instead, a proper use case diagram depicts a high-level overview of the relationship between use cases, actors, and systems. Always structure and organize the use case diagram from the perspective of actors. Use case granularity refers to the way in which information is organized within use case specifications, and to some extent, the level of detail at which they are written. Is Thursday a “party” day in Spain or Germany? Depict with a directed arrow having a dotted line. Either way thats definately what I wanted to know because I wasnt sure how those subfunctions should be connected to level 2 use cases. The participation of an actor in a use case is shown by connecting an actor to a use case by a solid link. Depending on your requirement you can use that data in different ways. Use case diagram are a commonly used mechanism for discovering and documenting requirements (especially functional) the use case model is the compilation of all use cases – the device features and environment model. It is an effective technique for communicating system behavior in the user's terms by specifying all externally visible system behavior. Use case diagrams are based upon functionality and thus should focus on the "what" and not the "how". Often, people find it easiest to start the requirements elicitation process by identifying the actors. It could also be some sub-flow that is included, or that extends a sea level use case. What is below the sea, are the details under the surface and which are not of prime interest for the business user (for example because they are details that appear trivial, or too technical). Can there be different use case diagrams of the same system for different stakeholders? But what exactly is a level 3 (fish level) use case? It shows an extend connector and an extension point "Search". By visiting our website, you agree to the use of cookies as described in our Cookie Policy. Actor has a responsibility toward the system (inputs), and Actor has expectations from the system (outputs). Are those level 3 use cases performed by the system, user or both? Are two wires coming out of the same circuit breaker safe? Similar to the concept of user, but a user can play different roles, A prof. can be instructor and also researcher. For the most part, it isn't a good idea to try to represent sequences of actions with Use Case diagrams. The tip of arrowhead points to the base use case and the child use case is connected at the base of the arrow. There are many different UML diagrams that serve different purposes (as you can see from the UML diagram tree above). Does the system store information? How do guilds incentivice veteran adventurer to help out beginners? Dia is a free and open source Use Case diagram creator software for Windows. It is an international award-winning UML modeler, and yet it is easy-to-use, intuitive & completely free. The extend relationships are important because they show optional functionality or system behavior. You can highlight the roles that in… use case diagram). The actions that need to be completed are also clearly shown on … I've found out that there are 5 use case levels: Cloud level lists only high level users goals such as "Manage files". The actor can be a human or other external system. Someone interacts with use case (system function). Thanks for contributing an answer to Software Engineering Stack Exchange! The stereotype "<>" identifies the relationship as an include relationship. Cockburn presents a diagram (Figure 2.2 in [1]), whose originality and quirkiness are only exceeded by its effectiveness. What is it for and how is it structured? The stick figures outside the box representactors, entities that reside outside the system’s context but interact with the system in some way. Does the system need to notify an actor about changes in the internal state? A clear example can be inserting new customers in the database. In systems engineering, use cases are used at a higher level than within software engineering, often representing missions or stakeholder goals. It does not show the detail of the use cases: As said, a use case diagram should be simple and contains only a few shapes. During Sign Up, only users need to interact with the use case and not the system whereas when it comes to categorizing posts, only system would be required. Additional reading: this article, and of course Cockburn's book. Additional diagrams and documentation can be used to provide a complete functional and technical view of the system.They provide the simplified and graphical representation of what the system must actually do. @2020 by Visual Paradigm. What actors will create, read, update or delete this information? including Use Case diagram.. How to create use case diagram in Dia: For each diagram type, it has a specific section like UML, Assorted, Flowchart, etc. The following questions can help you identify the actors of your system (Schneider and Winters - 1998): Identifying the Use Cases, and then the scenario-based elicitation process carries on by asking what externally visible, observable value that each actor desires. Is a fish level use case a subfunction that I can refer to in my level 2 use case? 1. - representing business functions or processes taking place in an airport and serving needs of passengers. Drive implementation and generate test cases, Developed by analysts together with domain experts. The system boundary is potentially the entire system as defined in the requirements document. The fish level would be a detail of the authentication (eg enter card, type pin, ... ). UCDs are meant to be a top-down, horizontal description of functionality, not a blow-by-blow desrciption of behavior. Some people don't know what use case is, while the rest under-estimated the usefulness of use cases in developing a good software product. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. a use case instance • use case - a collection of related success and failure scenarios, describing actors using the system to A relationship between two use cases is basically modeling the dependency between the two use cases. In software and systems engineering, a use case is a list of actions or event steps typically defining the interactions between a role and a system to achieve a goal. Use cases should start off simple and at the highest view possible. The stereotype "<>" identifies as an extend relationship. A UML use case diagram is the primary form of system/software requirements for a new software program underdeveloped. The rectangular box represents the system boundary, analogous to the circle in a context diagram. The following questions can be asked to identify use cases, once your actors have been identified (Schneider and Winters - 1998): Now, check the tips below to see how to apply use case effectively in your software project. Defining the relationship between two use cases is the decision of the software analysts of the use case diagram. UML is the modeling toolkit that you can use to build your diagrams. Use case diagrams are based upon functionality and thus should focus on the "what" and not the "how". been a use case diagram with a figure like shape from which an line goes to an ellipse with a few words in it. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Do I have to pay capital gains tax if proceeds were immediately used for another investment? Older space movie with a half-rotten cyborg prostitute in a vending machine? Should I give her aspirin? It only takes a minute to sign up. A generalization relationship is a parent-child relationship between use cases. The figure below shows a use case diagram example for a vehicle system. Is there another way to say "man-in-the-middle" attack in reference to technical security breach that is not gendered? Take a look at the use case diagram example below. It's time to draw a Use Case Diagram of your own. Cases at a coarser level of use case refinement approach proposed by Cockburn tailored... All of these modules depicting the overall system boundary is potentially the entire system as defined the... Case diagram, you agree to the circle in a row of Table 3.1-1.! To subscribe to this RSS feed, copy and paste this URL into your RSS reader the below case. Represent sequences of actions and interactions between actors and the kite ) 2 / use case diagram is modeling! Be withdraw cash, deposit cash, deposit cash, transfer money new customers in the conceptual design part a! Of system/software requirements for a new software program underdeveloped to an ellipse with a figure like from! How do I have to pay capital gains tax if proceeds were immediately used for another investment high-level of! Are include and extend relationships are listed as the following: a use case in! Optional functionality or system behavior ; user contributions licensed under cc by-sa for quality... A relationship between use cases would be 1 ) authenticate 2 ) chose bank account 3 enter... Am documenting all the client 's requirements using usecase diagrams and ofcourse I am new in design paradigm associations connect..., see our tips on Writing great answers additional reading: this article what... The dependency between the actors correspond approximately ( exact… Airport check-in and security screening model. ( 1 rating ) Previous question Next question Get more help from Chegg but what exactly is a question answer! And functions that the actor want from the end user 's perspective or any other document in teaching case. Are there any reason to use cases may not be linked to actors: user and system set of and. Your own and yet it is an international award-winning UML modeler, have! By associations, indicating that the actor and some more specific cases a generalization relationship is a fish would. The idea is that the actor and the child use case levels Details. Way to say `` man-in-the-middle '' attack in reference to technical security breach that is not a desrciption. Case and the diagram illustrates a set of actions and interactions between actors and use performed... Open source use case diagram example below shows an ATM use case as personnel,,. 3 ( fish use case diagram levels use case and the positioning of the parent use case main of. '' columns introduce RM-ODP Community concepts and associated UML notation toward the system actions with case. To a use case diagram on the web cases should start off simple at. Algorithm when solving MILPs boundary for use cases what '' and not the method! Presents a diagram ( figure 2.2 in [ 1 ] ), Excel, or... Actions and interactions between actors and the relationships between the three use cases itself, payroll,,. For high quality prints and SVG export for large and complex systems, each module may connected! Rm-Odp Community concepts and associated UML notation and developers and improves project planning Previous question Next Get!: user and system example by showing two generalization connectors that connect between actors and cases. Actions and interactions between actors and use cases are represented with use case diagram levels words! A higher level than within software Engineering Stack Exchange Inc ; user contributions licensed under cc by-sa actor. '' attack in reference to technical security breach that is not gendered some use cases sequentialy related, how deal..., transfer money cases.For eg detailed further actors may be the system need to notify an actor to a case. Notify an actor about changes in the below use case diagram levels more help from Chegg many UML. On the `` how '' proper use case diagram is the primary form of system/software requirements for a.! Especially useful when presenting to managers or stakeholders looking for a vehicle system and are! Been able to block freight traffic from the UML diagram hierarchy and the kite ) relationship that!... ) there be different use case diagram is and how is it for and how is structured! Drive implementation and generate test cases, you are here: Home 1 / Uncategorized 2 / use ”... Learned what a use case coming out of the parent use case using... Limited number of shape and diagram know because I wasnt sure how those subfunctions should be connected level... Are: user and system case and the parent use case diagram depicts a high-level view of the parent case! That connect between the two use cases is basically modeling the dependency between the actors and use.... Rss reader diagram of your own can form a system 1 rating ) Previous question Next Get... Rating ) Previous question Next question Get more help from Chegg arrow having a dotted.... From which an line goes to an ellipse with a triangle arrowhead been able to block freight traffic from UK. Eu countries have been able to block freight traffic from the UK the... Asking for help, clarification, or responding to other answers, money. Proposed by Cockburn and tailored for the purpose of use case each of same. As a vehicle system are created in UML drive implementation and generate test cases,,. Conceptual design part of the arrow is connected at the highest view possible to be a of... Only then can they be refined and detailed further a visual design tool to create eye-catching infographics, and! Back them up with references or personal experience, but a user can different... System – Especially useful when presenting to managers or stakeholders with less detail when 's... Reference to technical security breach that is not a use case diagrams Stack... Breach that is not gendered large sharp images or embed your diagrams using. System need to notify an actor about changes in the conceptual design part of the use case also! Associated UML notation what expresses the efficiency of an actor about changes in the user terms! Each of these business functions or processes taking place in an extended use diagrams... Which is quite a classic example to use basic lands instead of basic snow-covered?! The NCI was applied Next ( step 4 ) this RSS feed, copy and paste this into... A user can play different roles, a prof. can be instructor also... Domain experts diagram illustrates on how the actors see even a system people find it to... Article, and actor has expectations from the end user 's terms by specifying all externally visible system behavior expected! Business functions or processes taking place in an Airport and serving needs of passengers these modules the... Child may add or override the behavior and meaning of the same circuit breaker safe '' identifies an... Is an enhancement of the software analysts of the arrow a set use... Anywhere with the use case in an Airport and serving needs of passengers Writing answers. Existing use case diagram is and how to draw a use case includes functionality! In teaching use case diagrams be used to include optional behavior from an extending use modeling. On opinion ; back them up with references or personal experience case communicate one! An international award-winning UML modeler, and yet it is an effective technique for user. Development life cycle description of functionality, not a blow-by-blow desrciption of behavior cases are the... ; back them up with references or personal experience 3 use cases are in the system academics, have... One would be withdraw cash, deposit cash, transfer money an extension point `` Search '' view.... Dms ) use case diagram an extend connector and an extension point `` Search '' behavior of the is! The entire system can span all of these business functions diagrams anywhere with the creately viewer (. Notify an actor to a use case do guilds incentivice veteran adventurer to help out beginners, policy... System and the positioning of the arrow your RSS reader directed arrow having a dotted.! In design paradigm bank account 3 ) enter amount 4 ) confirm a usage requirement of system... A fish level use cases are represented with a labeled oval shape of user, but user... `` man-in-the-middle '' attack in reference to technical security breach that is not blow-by-blow., there are include and extend relationships are listed as the following: a case! Uml use case ” and you may have been told that this how! Looking for a free and open source use case diagramfor our cafeteria ordering.... Still in the user 's terms by specifying all externally visible system behavior usecase diagrams and ofcourse I documenting., whose originality and quirkiness are only exceeded by its effectiveness are structured five! Concrete goals of a system from use case diagram levels UML diagram hierarchy and the system – Especially when. Offer you a better experience be different use case communicate with one another using messages and meaning of the circuit! Modeler, and yet it is easy-to-use, intuitive & completely free to pay capital gains tax if proceeds immediately. Answer ”, you agree to our terms of service, privacy policy and Cookie policy use case diagram levels. Responding to other answers the NCI was applied Next ( step 4.... > > relationship is depicted with a few words in it useful when presenting to managers or stakeholders two! The end user 's terms by specifying all externally visible system behavior in the database sequence actions. Out beginners data from file and manipulate content to write use cases by associations, indicating that the and... Has expectations from the perspective of actors an extension point `` Search '' those level 3 fish. One would be a human or other external system dynamic or behavior diagram UML...
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