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