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Look at the highlighted line. Where can you place a 7? |
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In the left and middle box, there is both a 7 already, so we can't place another 7 here. |
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Because in the right box, there is not a 7 already, we have to check the columns here. We see now that there is only one space left for a 7 (green square). |
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Exercise: Try to find the 8 in the the highlighted line! |
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