// Interface declaration
    interface Animal 
    {
      function speak(): String
      function move(): String
    }
    // Abstract class partially implementing Animal
    abstract class Mammal implements Animal
    {
      var name: String
 
      construct(nameInput: String) 
      {
        this.name = nameInput
      }
 
      // Abstract method - must be implemented by subclass
      abstract function speak(): String;
 
      // Concrete method
      function move(): String 
      {
        return "${name} walks on land";
      };
    }

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