1,6,8,9,10,11,13 (in Section 1.3)
7,8,11 (in Section 1.4)
4,5,6,10,11,12 (in Section 1.5)
1,2,4,5,6,8,9 (in Section 1.6)

2,4,6,7,9,10,12,15,18 (in Section 2.1)
2,6,9,10,11,12,13,14,15,16,18,19,20 (in Section 2.2)
1,2,4,7,9,13,16,17,18,19 (in Section 2.3)
4,5,6,7,9,10,12 (in Section 2.4)

2,5,7,9,10,11,12,17 (in section 3.1)
1,4,6,7,8,10,14,15,19 (in Section 3.2)