Step 6Repeat for all the pre-printed numbers
Let's see what the result of all that erasing was.
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The fourth column going down.
has 6 numbers
1 3 4 9 2 5
so 6 7 and 8 are missing.
so the box between the 4 and 9 must
cant be a 6 or a 7 so it must be an 8.