(VAR f x xs g) (RULES app(app(map, f), nil) -> nil app(app(map, f), app(app(cons, x), xs)) -> app(app(cons, app(f, x)), app(app(map, f), xs)) app(app(app(comp, f), g), x) -> app(f, app(g, x)) app(twice, f) -> app(app(comp, f), f) )
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