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