MAYBE
41.72/12.07	MAYBE
41.72/12.07	
41.72/12.07	Problem:
41.72/12.07	 a(x1) -> b(c(b(x1)))
41.72/12.07	 a(b(x1)) -> x1
41.72/12.07	 c(c(b(x1))) -> a(c(c(x1)))
41.72/12.07	
41.72/12.07	Proof:
41.72/12.07	 Open
41.72/12.08	EOF