MAYBE
142.23/55.37	MAYBE
142.23/55.37	
142.23/55.37	Problem:
142.23/55.37	 a(a(b(x1))) -> b(a(x1))
142.23/55.37	 b(a(a(x1))) -> a(a(a(b(x1))))
142.23/55.37	 a(c(x1)) -> c(b(x1))
142.23/55.37	
142.23/55.37	Proof:
142.23/55.37	 Open
142.23/55.37	EOF