Shithead (card game) have three or more cards in their hand). The game continues sequentially in a clockwise direction unless certain wildcards are played (such as a Joker), depending on rule set. When a player has no single card that is higher in value than the card on top of the play pile, they must play they must pick up all the play pile (put it in their hand) and end their turn. Picking up the pile can often put a player at a great disadvantage when many cards have been played as they will have more cards to shed than other players.
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