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