3 ms·What they mean is that the card that has a 3 on the front might have an even number on the back.by quirino 3y agoWhat they mean is that the card that has a 3 on the front might have an even number on the back.mpeg 3y agoyep I just realised and edited my comment, I imagine the full question has a clearer description that OP cut down for the blog post.mlajtos 3y agoTo be fair and square, I added an explicit statement about consistency of the cards, so it is clear.