You can learn what melds your opponents are attempting to form, for example, by keeping track of the cards that are regularly removed from the discard pile. In a similar vein, you can tell if they are about to slots with paypalleave or still building their hands by seeing how fast they are discarding particular cards. It's crucial to watch how players behave and communicate with one another during the game in addition to watching how cards are dealt. Their degree of confidence or uncertainty regarding their current position in the game can be inferred from subtle clues like hesitation before picking up a card or a quick look at their hand.
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