MAYBE
44.07/12.37	MAYBE
44.07/12.37	
44.07/12.37	Problem:
44.07/12.37	 a(x1) -> b(x1)
44.07/12.37	 a(c(x1)) -> x1
44.07/12.37	 c(b(b(x1))) -> a(a(a(c(c(x1)))))
44.07/12.37	
44.07/12.37	Proof:
44.07/12.37	 Open
44.07/12.37	EOF