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README.md

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 #### Gang of Four
 
-- **Chain of Responsibility:** command objects are handled or passed on to other objects by logic-containing processing objects
+- [**Chain of Responsibility:**](/Common%20Design%20Patterns/Behavioral/ChainOfResponsibility/ChainOfResponsibility.md) command objects are handled or passed on to other objects by logic-containing processing objects
 - [**Command:**](/Common%20Design%20Patterns/Behavioral/Command/Command.md) command objects encapsulate an action and its parameters [[code]](/Common%20Design%20Patterns/Behavioral/Command/Command.playground/Contents.swift)
 - [**Interpreter:**](/Common%20Design%20Patterns/Behavioral/Interpreter/Interpreter.md) implement a specialized computer language to rapidly solve a specific set of problems
 - [**Iterator:**](/Common%20Design%20Patterns/Behavioral/Iterator/Iterator.md) iterators are used to access the elements of an aggregate object sequentially without exposing its underlying representation [[code]](/Common%20Design%20Patterns/Behavioral/Iterator/Iterator.playground/Contents.swift)