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