TRS: { a__minus(0(), Y) -> 0(), a__minus(s(X), s(Y)) -> a__minus(X, Y), a__geq(X, 0()) -> true(), a__geq(0(), s(Y)) -> false(), a__geq(s(X), s(Y)) -> a__geq(X, Y), a__div(0(), s(Y)) -> 0(), a__div(s(X), s(Y)) -> a__if(a__geq(X, Y), s(div(minus(X, Y), s(Y))), 0()), a__if(true(), X, Y) -> mark(X), a__if(false(), X, Y) -> mark(Y), mark(minus(X1, X2)) -> a__minus(X1, X2), mark(geq(X1, X2)) -> a__geq(X1, X2), mark(div(X1, X2)) -> a__div(mark(X1), X2), mark(if(X1, X2, X3)) -> a__if(mark(X1), X2, X3), mark(0()) -> 0(), mark(s(X)) -> s(mark(X)), mark(true()) -> true(), mark(false()) -> false(), a__minus(X1, X2) -> minus(X1, X2), a__geq(X1, X2) -> geq(X1, X2), a__div(X1, X2) -> div(X1, X2), a__if(X1, X2, X3) -> if(X1, X2, X3)} Fail