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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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@TheBrick(Tommy)
For playing with stuff thsi site is good it has stuff accessible to all levels and challenging to all.
http://www.math.hmc.edu/funfacts/ffiles/10006.8.shtml
http://www.math.hmc.edu/funfacts/random/