1
2
3
STEP1 4
STEP2 STEP3 5
6
7
8
9
1
Solution of Solution of Solution of Solution of Solution of Solution of Solution of Solution of Solution of Solution of Solution of Solution of Solution of Solution of Solution of Solution of Solution of Solution of Solution of Solution of Solution of Solution of Solution of Solution of
12
1 13
14
15
16
2 17
18
19
20
21
22
23
1 24
2 3 25
4 26
27