class Colorable()
  function Colorable( this, color )
    this.color := color;
  endfunction
endclass

class Drawable()
  function Drawable( this, x, y )
    this.x := x;
    this.y := y;
  endfunction
endclass

class GreenShape( Colorable, Drawable )
  function GreenShape( this )
    super( color := "green", x := 10, y := 20 );
  endfunction
endclass

var shape := GreenShape();
print( $"{shape.color} {shape.x} {shape.y}" ); // Output: green 10 20