195.95/50.04	MAYBE
195.95/50.04	
195.95/50.04	Problem:
195.95/50.04	 a(b(x1)) -> x1
195.95/50.04	 a(c(x1)) -> c(c(c(b(x1))))
195.95/50.04	 b(c(x1)) -> a(b(x1))
195.95/50.04	
195.95/50.04	Proof:
195.95/50.04	 Open
195.95/50.04	EOF