edge | Figure 4b | Figure 4c | Figure 4d |
0 | (0, 1, X, a, Y) | (0, 1, Y, a, X) | (0, 1, X, a, X) |
1 | (1, 2, Y, b, X) | (1, 2, X, a, X) | (1, 2, X, a, Y) |
2 | (2, 0, X, a, X) | (2, 0, X, b, Y) | (2, 0, Y, b, X) |
3 | (2, 3, X, c, Z) | (2, 3, X, c, Z) | (2, 3, Y, b, Z) |
4 | (3, 1, Z, b, Y) | (3, 0, Z, b, Y) | (3, 0, Z, c, X) |
5 | (1, 4, Y, d, Z) | (0, 4, Y, d, Z) | (2, 4, Y, d, Z) |
0 | (0, 1, X, a, Y) | (0, 1, Y, a, X) | (0, 1, X, a, X) |