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