MAYBE
163.08/55.44	MAYBE
163.08/55.44	
163.08/55.44	Problem:
163.08/55.44	 a(x1) -> b(x1)
163.08/55.44	 b(b(x1)) -> c(x1)
163.08/55.44	 c(a(c(x1))) -> a(b(c(a(x1))))
163.08/55.44	
163.08/55.44	Proof:
163.08/55.44	 Open
163.08/55.44	EOF