; @origtpdbfilename ./TRS/SK90/2.18.trs
; @xtcfilename "./TRS_Standard/SK90/2.18.xml"
(format TRS)
(fun sum 1)
(fun |0| 0)
(fun s 1)
(fun + 2)
(rule (sum |0|) |0|)
(rule (sum (s x)) (+ (sum x) (s x)))
(rule (+ x |0|) x)
(rule (+ x (s y)) (s (+ x y)))