(VAR X Y L) (RULES rev1(0,nil) -> 0 rev1(s(X),nil) -> s(X) rev1(X,cons(Y,L)) -> rev1(Y,L) rev(nil) -> nil rev(cons(X,L)) -> cons(rev1(X,L),rev2(X,L)) rev2(X,nil) -> nil rev2(X,cons(Y,L)) -> rev(cons(X,rev(rev2(Y,L)))) )
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