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