Wild card (cards) "Weli", a special 6 of Bells, the 7 of Bells and 7 of Acorns. In the game of Perlaggen there are six or seven wild cards: four permanent "Perlaggs" - K or "Maxl", 6 or "Weli", 7 or "Little Weli", the 7 of Bells or "Bell-Spitz" and 7 or "Eichelspitz" - as well as 3 "Trump "Perlaggs"" - the 7, Unter and Ober of Trumps. There is a tendency among some players to regard wild cards as "impure" or treat wild card games as silly or amateurish. While it is certainly true that a game with too many wild cards
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