👉 A backset is a set of elements that are not in any other subset of the original set. This concept is important in combinatorics, particularly in the study of graphs and networks. For example, consider a graph G = (V, E) with vertices V = {1, 2, 3} and edges E = {(1,2), (1,3), (2,3)}. The backset of this graph is the set of all pairs of distinct vertices that
