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Try this. It is probably best to do this through programmed automation, not with user-entered commands. On each move, each player draws all the cards from the discard pile, and if the discard pile has any fewer than four, he draws the rest from the deck. This may require a loop that draws one card at a time, checking each time whether the discard pile is empty. When a player ends his turn, he discards the rest of his hand. This allows his opponent to pick up what is left of his hand.