What is meant by a "preferential shuffle" by the dealer?

Here a dealer is counting the deck down (card counting) and is aware of all the cards that have been dealt. If a lot of high cards have been previously pitched, meaning the deck is now rich in small cards, creating an apparent disadvantage for the player, the rogue dealer keeps dealing. On the other hand, if many small cards have surfaced, allowing a positive expectation for the player, the dealer would shuffle.

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