Input TRS:
    1: a__zeros() -> cons(0(),zeros())
    2: a__tail(cons(X,XS)) -> mark(XS)
    3: mark(zeros()) -> a__zeros()
    4: mark(tail(X)) -> a__tail(mark(X))
    5: mark(cons(X1,X2)) -> cons(mark(X1),X2)
    6: mark(0()) -> 0()
    7: a__zeros() -> zeros()
    8: a__tail(X) -> tail(X)
Number of Rules: 8
Direct POLO(Pol) ... orients all.
	I(mark) = 3 * x1 + 1
	I(0) = 0
	I(a__tail) = 3 * x1 + 3
	I(a__zeros) = 3
	I(zeros) = 1
	I(cons) = 2 * x1 + x2 + 1
	I(tail) = 3 * x1 + 2
Number of Rules: 0