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