2
2
.........................5
6
6
7
8
........................9
10
12
14
14
1 6
.....................................1 8
1 8
..................................1 8
18
.............................1 8
................................1 9
1 9
............................1 9
..............................1 9
..................1 9
1 9
1 9
.......................2 0
2 0
20
22
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