/home/nowonder/forschung/aprove/TPDB05/TRS/TRCSR/Ex2_Luc03b_GM.trs

The program

(VAR X Y Z X1 X2)
(RULES 
a__fst(0,Z) -> nil
a__fst(s(X),cons(Y,Z)) -> cons(mark(Y),fst(X,Z))
a__from(X) -> cons(mark(X),from(s(X)))
a__add(0,X) -> mark(X)
a__add(s(X),Y) -> s(add(X,Y))
a__len(nil) -> 0
a__len(cons(X,Z)) -> s(len(Z))
mark(fst(X1,X2)) -> a__fst(mark(X1),mark(X2))
mark(from(X)) -> a__from(mark(X))
mark(add(X1,X2)) -> a__add(mark(X1),mark(X2))
mark(len(X)) -> a__len(mark(X))
mark(0) -> 0
mark(s(X)) -> s(X)
mark(nil) -> nil
mark(cons(X1,X2)) -> cons(mark(X1),X2)
a__fst(X1,X2) -> fst(X1,X2)
a__from(X) -> from(X)
a__add(X1,X2) -> add(X1,X2)
a__len(X) -> len(X)
)

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