Set (cards) rank and a quartet is one of four cards of the same rank. Usually a pair (2 cards of the same rank but different suits) is not counted as a "set"; but some games, such as Bieten or Perlaggen do include pairs as sets. A wild set, as opposed to a natural set, is one containing wild cards such as jokers or deuces rather than 'natural 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
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