MAYBE
33.22/10.30	MAYBE
33.22/10.30	
33.22/10.30	Problem:
33.22/10.30	 a(x1) -> x1
33.22/10.30	 a(b(x1)) -> b(b(a(a(c(x1)))))
33.22/10.30	 b(x1) -> x1
33.22/10.30	 c(b(c(x1))) -> x1
33.22/10.30	
33.22/10.30	Proof:
33.22/10.30	 Open
33.22/10.30	EOF