Pro Set trading cards Browns Center Cody Risien, but the card was withdrawn early due to his retirement during training camp, also resulting in a short print. The most sought after variation from 1990 Pro Set is card #204 Fred Marion of the New England Patriots. This card is rather controversial because the card features San Francisco 49ers player John Taylor in the background and the belt from Taylor's pants came undone. The positioning of the belt gives the appearance that his private area is exposed, but it is just a shadow and the belt. Various cards in the 1990 offering have three variations.
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