A set of numeric values may be represented using a data structure. The data structure is a graph having a root and leaves. A route in the data structure may represent a mask that represents a set of values. A mask may represent a term in a DNF representation of numeric values. A mask may represent numeric values that correspond to limitations set by the mask, such as having a predetermined value in a predetermined digit. The data structure comprises edges and nodes, each may be associated with a label. The label may represent a portion of a mask.