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If we fill in all candidates, we see immediatly that some squares have only one candidate. In the example, it is 2, 4 and 7. As soon as you fill in them, you can eliminate them in other cells and see that there are again some single candidates left. |
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Look at the highlighted line. What can you place in the empty squares? |
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In the first, 1 and 2 are still possible. In the other, only a 2. So, we will place this. We know now also that the only candidate left for the previous cell is 1. |
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