; @xtcfilename "./TRS_Standard/Zantema_15/ex13.xml"
(format TRS)
(fun f 2)
(fun s 1)
(fun d 1)
(fun |0| 0)
(rule (f x (s y)) (f (d x) y))
(rule (f x |0|) (f (s |0|) x))
(rule (d |0|) |0|)
(rule (d (s x)) (s (s (d x))))