(VAR c f h t )
(RULES 
        app(app(map_1, f), app(app(cons, h), t)) -> app(app(cons, app(f, h)), app(app(map_1, f), t))
        app(app(app(map_2, f), c), app(app(cons, h), t)) -> app(app(cons, app(app(f, h), c)), app(app(app(map_2, f), c), t))
        app(app(app(app(map_3, f), g), c), app(app(cons, h), t)) -> app(app(cons, app(app(app(f, g), h), c)), app(app(app(app(map_3, f), g), c), t))
        
)