Wallpaper Group p4mm

The final wallpaper group! p4mm

Here's the structure:

	a centre of rotation of order two (180°).
	a centre of rotation of order three (120°).
	a centre of rotation of order four (90°).
	a centre of rotation of order six (60°).
	an axis of reflection.
	an axis of glide reflection.

 Image and Key: Source: Wikipedia

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