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