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