0 QTRS
h(z, e(x)) → h(c(z), d(z, x)) d(z, g(0, 0)) → e(0) d(z, g(x, y)) → g(e(x), d(z, y)) d(c(z), g(g(x, y), 0)) → g(d(c(z), g(x, y)), d(z, g(x, y))) g(e(x), e(y)) → e(g(x, y))