MAYBE
123.55/55.33	MAYBE
123.55/55.33	
123.55/55.33	Problem:
123.55/55.33	 a(x1) -> b(x1)
123.55/55.33	 b(b(c(x1))) -> c(b(c(b(a(x1)))))
123.55/55.33	 c(c(x1)) -> x1
123.55/55.33	
123.55/55.33	Proof:
123.55/55.33	 Open
123.55/55.33	EOF