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http://en.wikipedia.org/wiki/Group_theory
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http://en.wikipedia.org/wiki/Wallpaper_group
http://xahlee.org/Wallpaper_dir/c5_17WallpaperGroups.html
http://www.patterninislamicart.com/
http://sillydragon.com/muybridge/Plate_0675.html
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http://www.apple.com/science/insidetheimage/bzreaction/images.html
http://en.wikipedia.org/wiki/Simple_Lie_group
http://en.wikipedia.org/wiki/List_of_simple_Lie_groups
http://en.wikipedia.org/wiki/Classification_of_finite_simple_groups
http://en.wikipedia.org/wiki/List_of_finite_simple_groups
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