./make-corpus 500 3 1000
igraph_watts_strogatz_game(&graph, /*dim=*/ 1, /*size=*/ nodes, /*nei=*/ edges_per_node, /*p=*/ 0.1, /*loops=*/ 0, /*multiple=*/ 0);
-- AVG diameter of generated graphs: 8.10
-- MAX diameter of generated graphs:  9
