5 Square Guide
[page 4]

Rule 3: No duplicates allowed...whether they are mirrors or rotations.


This is okay.
image: horizontal 1
The five squares are all there.
This is not if you have the other.
image: horizontal mirror
They are the same shape - a mirror.
 This one is a rotation of the first,
image: vertical bar
and isn't allowed if you have the first.

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