8.6: 13 (Optional: 20, 24, 26)
8.7: 6, 14, 15, 23, 30, 43, 52, 55, 63, 64 (Optional: 7, 9, 12, 22, 24, 28, 29, 44, 51, 58, 61, 62)
8.8: 12, 23 (Optional: 4, 11) *You don’t need to include a graph for #23.
9.1: 8, 11, 14, 31, 34 (Optional: 10, 15, 23, 26, 27, 29, 33, 36)