## X X A X A X X A X A X X X X X X X

If you repeat the process, again it will group all four of the aces together. So the key is you want to cut down exactly half the cards (or if you want to get more refined, half the packets) down in the deck. This means that if you want to cull eight cards, you need to cut down to a point where four are in the top packet and four are in the bottom packet. If you wanted to cull ten, you would cut down five and so on.

The third aspect, is an idea we have already touched on in the previous section, namely the idea of using existing cards, in this case, the bottom cards. For example, if the bottom card was a three and you wished to cull four of a kind, generally you would want to cull threes as it is easier to do than culling a specified four of a kind. In this case, you would want to cut the deck so the third three from the bottom up was at the bottom of the top packet allowing you to riffle those two together immediately. Generally, we try to use one card from the bottom for each hand we are stacking. In other words, if I am stacking a double duke, I use the two bottom cards. If I was stacking three hands, I would use the three bottom cards. If I was stacking four hands I would use the bottom four cards and so on. This raises the question of packets as opposed to cards. Consider for example the idea of culling two hands of four of a kind. Say the bottom two cards are a five and a seven. You would then want to cull fives and sevens, but because two cards are already grouped together at the bottom of the deck, meaning that your eight cards make up not eight packets but seven, potentially less. This means that no matter how you cut you will left with an odd packet (card), though that is actually a good thing as I will explain later it must be considered. This idea of considering packets rather than merely cards will be important later, particularly when dealing with the impossible stack, so bear it in mind. For now, it may help to examine the idea of culling two hands of three of a kind and one hand of four of a kind. In this case we would use the bottom three cards (one of the beauties of using the bottom cards is that you can glimpse and note their faces immediately upon starting the peeking process). We will assume the bottom three cards were ace, two, three and that you want to cull four aces, three twos and three threes. You are starting with three of your ten cards on the bottom of the deck and so rather than having ten packets, you have eight. (I did the calculation by taking the total number of cards to be culled, subtracted the number of cards on the bottom (already culled) and adding one, since those on the bottom are non-existent, they form one packet.) If this is the case, then you want to take eight, divide it by two for the number of packets, leaving you with four and then adding two for the two additional cards already considered to be culled. This leaves you with six, meaning that you need to cut past the sixth card down in the deck to the seventh card as follows ("A" is ace, "2" is two, "3" is three and "X" means a group of indifferent cards):

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