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