MAYBE
224.01/56.80	MAYBE
224.01/56.80	
224.01/56.80	Problem:
224.01/56.80	 c(c(b(x1))) -> a(c(b(x1)))
224.01/56.80	 a(c(b(a(x1)))) -> b(c(c(x1)))
224.01/56.80	 b(a(c(x1))) -> a(b(c(a(x1))))
224.01/56.80	 b(c(a(x1))) -> c(a(b(x1)))
224.01/56.80	
224.01/56.80	Proof:
224.01/56.80	 Open
224.01/56.80	EOF