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