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