Wallpaper Group P31M

I'm still having lots of fun with the MadPattern templates.

For you math nerds out there, here's the underlying structure: 

Key

	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