Clues and Strategies:
If there's a match of the digit inside a square and the number of white spaces around
it, quickly fill them with light bulbs. Otherwise,
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If any of those 4 corners contains a bulb, then there will be insufficient blank
squares to place the 3 bulbs.
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Similar idea as above.
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Similar idea as above. Note that the two black squares must form an L-shape figure;
if they are on the opposite sides, then this won't work.
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**Remember, squares labeled with red x's and boundaries have the same effect as
black, filled ones. So the cases in the table above provide the general idea but
are not limited to the exact same situation.
Sometimes, you may encounter problems in which things can go either way. Our advice
is to make a guess that will give you the most follow-up progress and check if it
leads to a false conclusion. If it does, then you know that your assumption was
incorrect so you can move on to other possibilities.(Logical deductions always work;
so does picturing everything in your mind, but they normally require a lot of extra
effort and time.)
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