195.83/50.01	MAYBE
195.83/50.01	
195.83/50.01	Problem:
195.83/50.01	 a(x1) -> x1
195.83/50.01	 a(x1) -> b(x1)
195.83/50.01	 a(b(c(x1))) -> c(c(b(a(a(x1)))))
195.83/50.01	 c(x1) -> x1
195.83/50.01	
195.83/50.01	Proof:
195.83/50.01	 Open
195.83/50.02	EOF