| Step 5 - Fill in 1s. |
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Next, let's fix 1s.
We fixed the first 1 on the bottom center. |
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To make it valid, we need to put 1s in the exposed cells on the pink lines. In this case, two 1s are easily fixed to the marked exposed cells. |
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Step 6 - Leave 1's and put 4's |
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Here just leave 1s for now and consider other figures. For example, place a 4 on the middle right. It will be valid by placing 4s on the marked exposed cells. |
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Here, let's check how many cells can be filled if the marked exposed cell becomes 4. |
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The marked cell will be fixed as 4. |
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We can't find any other cells for 4, for now. |
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Step 7 - Lets come back to 1's |
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Coming back to 1s, the marked cell becomes 1. |
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