So essentially, we are restricting our equally likely possibilities now to the situation where B has happened. Given B means we're assuming that B has happened. So now we're restricting our sample space of possible outcomes where B has happened to this right over here. So now there are one, two, three, four, five, six equally likely outcomes. And how many of them involve A happening? Well, this one right over here that we had already circled. This is the one out of the six equally likely outcomes that involve doubles.