MAYBE
137.85/55.40	MAYBE
137.85/55.40	
137.85/55.40	Problem:
137.85/55.40	 a(a(a(a(x1)))) -> a(b(a(b(x1))))
137.85/55.40	 b(a(b(x1))) -> a(b(a(x1)))
137.85/55.40	
137.85/55.40	Proof:
137.85/55.40	 Open
137.85/55.41	EOF