a)
1, 5
8, 6
11
12, 10, 15
2
9, 3, 7
18
4, 14, 16
13, 20, 19
17
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Answers & Comments
a)
1, 5
8, 6
11
12, 10, 15
2
9, 3, 7
18
4, 14, 16
13, 20, 19
17