classDiagram
    Animal <|-- Duck
    Animal <|-- Fish
    Animal : +int age
    Animal : +String gender
    Animal: +isMammal()
    class Duck{
        +String beakColor
        +swim()
    }
          

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flowchart LR
    A[開始] --> B(プロセスの実行)
    B --> C{判定}
    C -->|OK| D[完了]
    C -->|NG| A
          

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