An in shuffle is a type of perfect shuffle done in two steps:
- Split the cards exactly in half (a bottom half and a top half) and then
- Interweave each half of the deck such that every-other card came from the same half of the deck.
If this shuffle moves the top card to be 2nd from the top then it is an in shuffle, otherwise it is known as an out shuffle.
Read more about In Shuffle: Example, Mathematics, Computer Science
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