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[20] [Frieze Groups]: http://en.wikipedia.org/wiki/Frieze_group.
[21] [Groups]: http://en.wikipedia.org/wiki/Group_%28mathematics%29.
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[24] [Wallpaper Groups]: http://en.wikipedia.org/wiki/Wallpaper_group#cite_ref-0
[25] [Wallpaper Groups]: http://www.clarku.edu/\simdjoyce/wallpaper/index.html
)