By doing this, you may avoid finding yourself stuck with a valuable card that you can't use in any sets or runs. Observing the cards that other players are slots machine 777picking up and discarding is another tactic for creating melds. This can tell you important details about the cards that have been discarded and those that are still in play. It's also critical to maintain track of the cards that have been played so that you don't pick up a card that has already been discarded.