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113 bytes added ,  23:49, January 23, 2007
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Lines are concurrent if they contain the same point. In other words, concurrent lines are lines which intersect.
Block, SkipCaptcha, nsAm_Govt_101RO, nsAm_Govt_101RW, nsAm_Govt_101_ta, nsTeam2RO, nsTeam2RW, nsTeam2_talkRO, nsTeam2_talkRW
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