MAYBE
33.61/10.18	MAYBE
33.61/10.18	
33.61/10.18	Problem:
33.61/10.18	 a(b(x1)) -> x1
33.61/10.18	 a(c(x1)) -> a(b(b(c(c(a(x1))))))
33.61/10.18	 b(c(x1)) -> x1
33.61/10.18	
33.61/10.18	Proof:
33.61/10.18	 Open
33.61/10.19	EOF