Help Wanted With David Lovel Card Trick

[Segilla]

This question is only for people who know this trick. We are having difficulty understanding how to place the cards. The following is the advice. Can anyone revise it to make it clearer please?

4. Take the twenty cards and deal them out, putting cards in the same pair on matching letters in the following code. For example, put the first two cards on the two D's, the next two on the two A's etc. It doesn't matter which order you do it in, as long as you keep the cards in pairs (you could start with the two B's). It is important to memorise the code and make it look as if you are putting the cards down in a completely random order.

[Tuvok]

Just googled it and I think if you write out the grid it might make it clearer.

Think about how the magic number cards work - that might help.

[Segilla]

Thanks Tuvok. All is clear now.