MAYBE
143.75/55.34	MAYBE
143.75/55.34	
143.75/55.34	Problem:
143.75/55.34	 a(x1) -> b(x1)
143.75/55.34	 a(b(x1)) -> x1
143.75/55.34	 c(c(b(x1))) -> a(c(a(c(c(x1)))))
143.75/55.34	
143.75/55.34	Proof:
143.75/55.34	 Open
143.75/55.34	EOF