first pass through the deck? we discard the 10, discard the 8, put the 1 onto the slot for spades, discard a bunch of other cards, put the 2 onto the 1, discard the 13, discard the 9, put the 3 onto the 2, and discard the 12. that’s it for the first pass.
you may now note that we managed to remove the first three cards from our deck: first the 1, then the 2, and then the 3. we were able to remove the 2 in the same pass as the 1 because the 2 appeared later in the deck. we were able to remove the 3 in the 