; @origtpdbfilename ./TRS/SK90/2.51.trs
; @xtcfilename "./TRS_Standard/SK90/2.51.xml"
(format TRS)
(fun ack 2)
(fun |0| 0)
(fun s 1)
(rule (ack |0| y) (s y))
(rule (ack (s x) |0|) (ack x (s |0|)))
(rule (ack (s x) (s y)) (ack x (ack (s x) y)))