218.26/50.37	MAYBE
218.26/50.37	
218.26/50.37	Problem:
218.26/50.37	 b(a(b(x1))) -> a(b(a(x1)))
218.26/50.37	 b(b(a(x1))) -> b(b(b(x1)))
218.26/50.37	 c(a(x1)) -> a(b(c(x1)))
218.26/50.37	 c(b(x1)) -> b(a(c(x1)))
218.26/50.37	
218.26/50.37	Proof:
218.26/50.37	 Open
218.26/50.38	EOF