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### Graph Modification

| (add-vertex! vertex graph )

| (add-vertices! lower_bound upper_bound graph )

| (add-edge! set <vertex *> graph )

| (add-edges! mset <set <vertex *>> graph )

| (add-edges! mset <sequence <vertex *>> graph )

| (remove-vertex! vertex graph )

| (remove-edge! edge graph )

| (remove-edges! <list of edges> graph )