197.17/50.40	MAYBE
197.17/50.40	
197.17/50.40	Problem:
197.17/50.40	 b(b(b(b(x1)))) -> b(a(a(a(x1))))
197.17/50.40	 a(a(b(a(x1)))) -> b(b(b(a(x1))))
197.17/50.40	 b(b(a(b(x1)))) -> a(a(b(b(x1))))
197.17/50.40	
197.17/50.40	Proof:
197.17/50.40	 Open
197.17/50.41	EOF