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Mirror, Mirror Puzzle

The Puzzle:

If you continue shading the squares so that the two dotted lines become lines of symmetry (mirror lines) of the completed diagram, how many squares will be left unshaded?



If you continue shading the squares so that the two lines become mirror lines, we get this:


(Note: I have shaded the new squares differently just so that you can see where they go.)

The number of squares left is then 9.

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