Friday 28 September 2007 photo 6/42
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a(c+b)-c(a-d)+d(b-c)-b(a+d) (ac-ab)-(ac-cd)+(db-cd)-(ab+db) ac+ab-ac+cd+db-cd+db-db ac-ac+ab-ab+cd-cd+db-db=0rka
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Anonymous
Mon 1 Oct 2007 22:25
oooh , huvudväärk !
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