Let me see, whether this is right because this let me see this A 1 A 3 now, this will be Y dash minus this into this, let me know A 1 into we had into this one, m minus Y v this into this. See, this is A 3 A 4 B 3 B 4. So, A 1 B 3 is ok, and A 3 B 1 is ok, see that is how what it is see, this is my A 1, this is my B 3, this is my B 1, this is my A 3, like that you know