When three or more consecutive cards of the same suit, without jokers, make up a pure sequence, it's important to watch out for this particular combo. To declare "Rummy" and endpenny slots the game, pure sequences are necessary, which means that winning requires them. Since pure sequences are frequently the hardest combinations to form, it's critical to focus on forming them early in the game. Recognizing sets, which are made up of three or four cards with the same rank but different suits, is another crucial combination to understand.