2.1
2, 6, 10, 12
2.2
1, 2, 6, 8, 15, 19
2.3
2, 3, 6-e, 9, 11
2.4
1-a, 4, 5, 6
2.5
1-a, 4, 11, 12
2.6
1-a, 2-h, 3-a, 4-h