MAYBE
50.57/20.58	MAYBE
50.57/20.58	
50.57/20.58	Problem:
50.57/20.58	 a(x1) -> x1
50.57/20.58	 a(b(x1)) -> c(x1)
50.57/20.58	 b(x1) -> x1
50.57/20.58	 c(c(x1)) -> b(b(a(a(c(x1)))))
50.57/20.58	
50.57/20.58	Proof:
50.57/20.58	 Open
50.57/20.58	EOF