197.61/50.42	MAYBE
197.61/50.42	
197.61/50.42	Problem:
197.61/50.42	 b(b(a(b(x1)))) -> a(b(a(b(x1))))
197.61/50.42	 a(a(a(a(x1)))) -> b(b(b(b(x1))))
197.61/50.42	 b(b(a(b(x1)))) -> a(a(a(b(x1))))
197.61/50.42	
197.61/50.42	Proof:
197.61/50.42	 Open
197.81/50.43	EOF