A brute force algorithm to try and encode a word into a sudoku.
When a user enters a sentence, eg "Hello", the sudoku encoder will try and convert this into a decoderable sudoku. Eg: H = 123, E = 456, L = 789, O = 132.
Thus:
1 2 3 4 5 6 7 8 9
7 8 9 1 3 2 x x x
x x x x x x x x x
...
The encoder creates many combinations for each letter based on its popularity. For example A can be 123, 782, 563 or 213; whilst Z might just be 943.