| This technique is also another very common game-starting technique. |
| Look for any three occurrences of the same number in any row or column. |
The logic of the game states that no two adjacent cells may be painted, yet there may only be one unique occurrence of a given number in any row or column.
The only possible way to mark these cells is to paint (set) either end of the sequence of three cells, and circle the centre cell. |
