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