1No vertices. 2directed: false 3vcount: 0 4edges: { 5} 6 7One vertex, directed, with loops. 8directed: true 9vcount: 1 10edges: { 110 0 12} 13 14Six vertices, directed, only edges from block 0 to 1 and 2 to 2. 15directed: true 16vcount: 6 17edges: { 180 2 190 3 201 2 211 3 224 4 234 5 245 4 255 5 26} 27 28Six vertices, directed, only edges from block 0 to 1 and 2 to 2, no loops. 29directed: true 30vcount: 6 31edges: { 320 2 330 3 341 2 351 3 364 5 375 4 38} 39 40Six vertices, undirected, only edges between block 0 and 1, and inside block 2. 41directed: false 42vcount: 6 43edges: { 440 2 450 3 461 2 471 3 484 4 494 5 505 5 51} 52 53Six vertices, undirected, only edges between block 0 and 1, and inside block 2, no loops. 54directed: false 55vcount: 6 56edges: { 570 2 580 3 591 2 601 3 614 5 62} 63 64Check for nonsquare matrix error handling. 65Check for preference matrix probability out of range error handling. 66Check for nonsymmetric preference matrix for undirected graph error handling. 67Check for incorrect block size vector error handling. 68Check for negative block size error handling. 69Check for sum of block sizes not equal to number of vertices error handling. 70