198.29/50.40	MAYBE
198.29/50.40	
198.29/50.40	Problem:
198.29/50.40	 b(a(a(b(x1)))) -> b(a(b(a(x1))))
198.29/50.40	 b(a(a(a(x1)))) -> b(a(b(b(x1))))
198.29/50.40	 a(b(a(b(x1)))) -> b(b(b(b(x1))))
198.29/50.40	 a(b(a(b(x1)))) -> a(a(a(b(x1))))
198.29/50.40	
198.29/50.40	Proof:
198.29/50.40	 Open
198.29/50.41	EOF