class Animal()
  function Animal( this, name )
    this.name := name;
  endfunction
endclass

class Walker()
  function Walker( this, walk_speed )
    this.walk_speed := walk_speed;
  endfunction
  function Speak( this )
    print( "Woof!" );
  endfunction
endclass

class Dog( Animal, Walker )
  var static_var;

  function Dog( this, name, breed, speed )
    Animal( name );
    Walker( speed );
    this.walk_speed := walk_speed;
  endfunction
endclass

// var dog := Dog(name, breed, speed);
// dog.Speak( );

// Dog.Speak( dog );