DNSL.betweenness        Computed betweenness via duplication of nodes
                        with self-loops (Duplicated Nodes with Self
                        Loops)
DNSLbetweenness_for_graph
                        Computes betweenness via duplication of nodes
                        with self-loops for a graph
betweenness.with.duplicated.nodes
                        Computes betweenness of an igraph object that
                        already has duplicated nodes
dup.nodes.from.data.frame
                        Creates an igraph object from a data frame with
                        self-loops
dup.nodes.from.graph    Creates an igraph object from a igraph some of
                        whose nodes have self-loops
florentine.sn           Data on matrimonial and commercial links of
                        Florentine families
