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