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