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