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