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