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