0 QTRS
g(c, g(c, x)) → g(e, g(d, x)) g(d, g(d, x)) → g(c, g(e, x)) g(e, g(e, x)) → g(d, g(c, x)) f(g(x, y)) → g(y, g(f(f(x)), a)) g(x, g(y, g(x, y))) → g(a, g(x, g(y, b)))