Patent ID: 8572005

Claim:
A data structure comprising a Disjunctive Normal Form (DNF) representation of a set of values, the data structure embodied in a non-transitory computer-readable media, the data structure comprising: a plurality of nodes comprising a root and a leaf; a plurality of edges, each edge of the plurality of edges connecting two nodes of said plurality of nodes; a plurality of labels, each of the plurality of labels is associated with an element selected from the group consisting of a node that is comprised by said plurality of nodes and an edge that is comprised by said plurality of edges; wherein a first label of said plurality of labels includes a don't care symbol which represents a group of two or more alternative assignments to a digit; and wherein a route between the root and the leaf represents a mask that groups a portion of the set of values, the route comprises a sequence of nodes comprised by said plurality of nodes which are connected by connecting edges that are comprised by said plurality of edges, the mask is defined by a list of labels of said plurality of labels associated with the sequence of nodes and the connecting edges.