5 Square Guide
[page 5]

Rule 4: No Mirrors allowed. They are duplications just like rotations are duplications.


This is okay.
image: L shape
The five squares are all there.
This is not okay if you have the other.
image: L left shape
They are the same shape. A Mirror.
 Mirrors have the same shape. They just "reverse" or "flip" and you can only have one of each possible shape.

The grid is just a convenience. The five squares can be built anywhere if you follow the other rules.

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