20
20 16 18 15 13 19 14 11 12 17 
19 17 11 12 14 18 16 13 15 20 
16 19 18 17 20 12 13 14 11 15 
12 14 15 18 11 16 19 17 20 13 
17 11 14 13 20 18 12 15 16 19 
20 13 18 12 15 16 19 14 17 11 
14 18 20 12 15 13 19 16 11 17 
11 13 19 15 14 12 18 17 16 20 
11 14 16 18 19 17 13 12 20 15 
19 20 13 12 15 14 11 17 16 18 
1 4 6 9 10 5 2 8 7 3 
10 9 8 6 7 4 3 5 2 1 
4 5 6 8 7 9 3 1 10 2 
6 10 8 1 4 3 7 9 5 2 
5 10 6 9 3 4 2 8 1 7 
7 8 2 4 9 5 10 1 3 6 
2 3 1 10 5 7 8 4 6 9 
1 3 10 4 2 6 7 8 9 5 
4 6 7 3 9 10 1 5 2 8 
2 9 8 4 7 3 5 6 10 1 
forbidden 1 17
forbidden 1 18
forbidden 1 19
forbidden 2 12
forbidden 2 13
forbidden 3 11
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forbidden 3 14
forbidden 3 15
forbidden 3 19
forbidden 4 13
forbidden 4 17
forbidden 4 20
forbidden 5 13
forbidden 5 17
forbidden 5 18
forbidden 5 19
forbidden 5 20
forbidden 6 11
forbidden 6 14
forbidden 6 15
forbidden 6 17
forbidden 6 20
forbidden 7 13
forbidden 7 16
forbidden 7 17
forbidden 7 19
forbidden 7 20
forbidden 8 11
forbidden 8 12
forbidden 8 13
forbidden 8 14
forbidden 8 15
forbidden 8 17
forbidden 8 20
forbidden 9 11
forbidden 9 12
forbidden 9 20
forbidden 10 11
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forbidden 10 17
forbidden 10 20