bug fixed.
"Number Place" is a game where players enter numbers 1 to 9 in 9 by 9 cells,
which consist of 9 sets of 3 by 3 cells, in columns, rows, and 3 by 3 cells without overlapping any two of them.
- The 9 by 9 cells, which consist of 9 groups of 3 by 3,
already contain the numbers in question.
- If you manage to enter numbers 1 to 9 in columns, rows,
and 3 by 3 cells without overlaps based on the numbers in question, the game is over.
