No vertices: ( ) Directed graph with loops and multi-edges, order 0: ( 1 1 1 1 1 1 ) Directed graph with loops and multi-edges, order 1, ignoring direction: ( 3 3 3 4 2 1 ) Directed graph with loops and multi-edges, order 1, only checking IGRAPH_IN: ( 2 2 2 3 2 1 ) Directed graph with loops and multi-edges, order 10, ignoring direction: ( 5 5 5 5 5 1 ) Directed graph with loops and multi-edges, order 2, mindist 2, IGRAPH_OUT: ( 1 1 2 0 0 0 ) Directed graph with loops and multi-edges, order 4, mindist 4, IGRAPH_ALL: ( 0 0 0 0 0 0 ) Negative order. Negative mindist.