(VAR x y xs f)
(RULES
  app(intlist, nil) -> nil
  app(intlist, app(app(cons, x), y)) -> app(app(cons, app(s, x)), app(intlist, y))
  app(app(int, 0), 0) -> app(app(cons, 0), nil)
  app(app(int, 0), app(s, y)) -> app(app(cons, 0), app(app(int, app(s, 0)), app(s, y)))
  app(app(int, app(s, x)), 0) -> nil
  app(app(int, app(s, x)), app(s, y)) -> app(intlist, app(app(int, x), y))

  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(filter,f),nil) -> nil
  app(app(filter,f),app(app(cons,x),xs)) -> app(app(app(app(filter2,app(f, x)),f),x),xs)
  app(app(app(app(filter2,true),f),x),xs) -> app(app(cons,x),app(app(filter,f),xs))
  app(app(app(app(filter2,false),f),x),xs) -> app(app(filter,f),xs)

)
(STRATEGY INNERMOST)