1No vertices: 2( ) 3Directed graph with loops and multi-edges, order 0: 4( 1 1 1 1 1 1 ) 5Directed graph with loops and multi-edges, order 1, ignoring direction: 6( 3 3 3 4 2 1 ) 7Directed graph with loops and multi-edges, order 1, only checking IGRAPH_IN: 8( 2 2 2 3 2 1 ) 9Directed graph with loops and multi-edges, order 10, ignoring direction: 10( 5 5 5 5 5 1 ) 11Directed graph with loops and multi-edges, order 2, mindist 2, IGRAPH_OUT: 12( 1 1 2 0 0 0 ) 13Directed graph with loops and multi-edges, order 4, mindist 4, IGRAPH_ALL: 14( 0 0 0 0 0 0 ) 15Negative order. 16Negative mindist. 17