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