Set (cards) Set (cards) A set or group in card games is a scoring combination consisting of three or more playing cards of the same rank; in some games, such as Bieten, a set may also comprise just two cards (a 'pair'). Sets are one of the two types of meld that may be used in games where melding is part of the play; the other being a set or sequence. A set or group comprises 3 or 4 cards of the same rank and, usually, different suits. A prial (pair royal) or triplet is a set of 3 cards of equal
Partition of a set into the connected components of the subgraph formed by the given set of edges. In this way, the lattice of partitions corresponds to the lattice of flats of the graphic matroid of the complete graph. Another example illustrates the refining of partitions from the perspective of equivalence relations. If "D" is the set of cards in a standard 52-card deck, the "same-color-as" relation on "D" – which can be denoted ~ – has two equivalence classes: the sets {red cards} and {black cards}. The 2-part partition corresponding to ~ has a refinement that yields the "same-suit-as" relation ~, which has