MAYBE
253.77/64.51	MAYBE
253.77/64.51	
253.77/64.51	Problem:
253.77/64.51	 a__nats() -> cons(0(),incr(nats()))
253.77/64.51	 a__pairs() -> cons(0(),incr(odds()))
253.77/64.51	 a__odds() -> a__incr(a__pairs())
253.77/64.51	 a__incr(cons(X,XS)) -> cons(s(mark(X)),incr(XS))
253.77/64.51	 a__head(cons(X,XS)) -> mark(X)
253.77/64.51	 a__tail(cons(X,XS)) -> mark(XS)
253.77/64.51	 mark(nats()) -> a__nats()
253.77/64.51	 mark(incr(X)) -> a__incr(mark(X))
253.77/64.51	 mark(pairs()) -> a__pairs()
253.77/64.51	 mark(odds()) -> a__odds()
253.77/64.51	 mark(head(X)) -> a__head(mark(X))
253.77/64.51	 mark(tail(X)) -> a__tail(mark(X))
253.77/64.51	 mark(cons(X1,X2)) -> cons(mark(X1),X2)
253.77/64.51	 mark(0()) -> 0()
253.77/64.51	 mark(s(X)) -> s(mark(X))
253.77/64.51	 a__nats() -> nats()
253.77/64.51	 a__incr(X) -> incr(X)
253.77/64.51	 a__pairs() -> pairs()
253.77/64.51	 a__odds() -> odds()
253.77/64.51	 a__head(X) -> head(X)
253.77/64.51	 a__tail(X) -> tail(X)
253.77/64.51	
253.77/64.51	Proof:
253.77/64.51	 Open
253.77/64.51	EOF