0 QTRS
f(true, x, y, z) → f(gt(x, plus(y, z)), x, s(y), z) f(true, x, y, z) → f(gt(x, plus(y, z)), x, y, s(z)) plus(n, 0) → n plus(n, s(m)) → s(plus(n, m)) gt(0, v) → false gt(s(u), 0) → true gt(s(u), s(v)) → gt(u, v)