199.45/50.52	MAYBE
199.45/50.52	
199.45/50.52	Problem:
199.45/50.52	 a(a(a(a(x1)))) -> a(b(b(a(x1))))
199.45/50.52	 b(b(b(a(x1)))) -> a(a(b(a(x1))))
199.45/50.52	 a(b(b(a(x1)))) -> b(a(a(b(x1))))
199.45/50.52	
199.45/50.52	Proof:
199.45/50.52	 Open
199.45/50.52	EOF