/home/nowonder/forschung/aprove/TPDB05/TRS/SK90/2.51.trs

The program

(VAR x y z)
(RULES
ack(0,y) -> s(y)
ack(s(x),0) -> ack(x,s(0))
ack(s(x),s(y)) -> ack(x,ack(s(x),y))
)
(COMMENT Example 2.51 in \cite{SK90})

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