(VAR x y z) (RULES rev(nil) -> nil rev(++(x,y)) -> ++(rev1(x,y),rev2(x,y)) rev1(x,nil) -> x rev1(x,++(y,z)) -> rev1(y,z) rev2(x,nil) -> nil rev2(x,++(y,z)) -> rev(++(x,rev(rev2(y,z)))) ) (COMMENT Example 4.24 (Reverse) in \cite{SK90})
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