MAYBE
41.82/11.24	MAYBE
41.82/11.24	
41.82/11.24	Problem:
41.82/11.24	 a(b(x1)) -> x1
41.82/11.24	 a(c(x1)) -> b(b(c(c(a(a(x1))))))
41.82/11.24	 b(c(x1)) -> x1
41.82/11.24	
41.82/11.24	Proof:
41.82/11.24	 Open
41.82/11.25	EOF