4
3
7
8
8
9
3
6
2
1
8
7
7
9
9
1
4
6
7
5
3
5
6
4
1
7
7
8
6
9
3
1
9
3
8
1
5
Some hospitals use Sudoku as a cognitive exercise for patients recovering from strokes or brain injuries.
Some hospitals use Sudoku as a cognitive exercise for patients recovering from strokes or brain injuries.
Some hospitals use Sudoku as a cognitive exercise for patients recovering from strokes or brain injuries.
Some hospitals use Sudoku as a cognitive exercise for patients recovering from strokes or brain injuries.