MAYBE
182.26/55.51	MAYBE
182.26/55.51	
182.26/55.51	Problem:
182.26/55.51	 a(d(x1)) -> d(b(c(b(d(x1)))))
182.26/55.51	 a(x1) -> b(b(f(b(b(x1)))))
182.26/55.51	 b(d(b(x1))) -> a(d(x1))
182.26/55.51	 d(f(x1)) -> b(d(x1))
182.26/55.51	
182.26/55.51	Proof:
182.26/55.51	 Open
182.26/55.51	EOF