MAYBE
223.80/56.76	MAYBE
223.80/56.76	
223.80/56.76	Problem:
223.80/56.76	 a(b(x1)) -> b(c(a(x1)))
223.80/56.76	 b(c(x1)) -> c(b(b(x1)))
223.80/56.76	 a(c(x1)) -> c(a(b(x1)))
223.80/56.76	 a(a(x1)) -> a(d(d(d(x1))))
223.80/56.76	 d(a(x1)) -> d(d(c(x1)))
223.80/56.76	 a(d(d(c(x1)))) -> a(a(a(d(x1))))
223.80/56.76	 e(e(f(f(x1)))) -> f(f(f(e(e(x1)))))
223.80/56.76	 e(x1) -> a(x1)
223.80/56.76	 b(d(x1)) -> d(d(x1))
223.80/56.76	
223.80/56.76	Proof:
223.80/56.76	 Open
223.80/56.76	EOF