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[ ] Dancing Links
Solution Write back
Toogle immediate
regex paste for 3x3 Not possible: don't know the structure
Default full board: If backsapce end up empty: do solve If insert invalid character: output set to invalid character If insert valid character: do solve
Board state:
- Invalid character: Valid: '0'-'9' or '' Invalid: Any character not in ['0'-'9'] e.g. '0', ' ', ''', '.'
- UNSOLVABLE: Direct repetition / Indirect repetition
- SOLVABLE => OK, Update Output