MAYBE
33.66/10.32	MAYBE
33.66/10.32	
33.66/10.32	Problem:
33.66/10.32	 a(x1) -> x1
33.66/10.32	 a(x1) -> b(x1)
33.66/10.32	 a(b(x1)) -> b(a(c(x1)))
33.66/10.32	 b(x1) -> x1
33.66/10.32	 c(c(x1)) -> a(x1)
33.66/10.32	
33.66/10.32	Proof:
33.66/10.32	 Open
33.66/10.33	EOF