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Solving methods
| unusable | available | required | method |
|---|---|---|---|
| 0. Fill the unique candidate | |||
| 1. Fill the unique cell | |||
| 2. Shared cells | |||
| 3. Twin cells | |||
| 4. Triplet cells | |||
| 5. X-Wing | |||
| 6. Ariadne's thread (single) | |||
| 7. Ariadne's thread (double) |
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