Petkevich Olga Vladimirovna computer science teacher at MBOU "Ermakovskaya secondary school No. 1"...
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Mathematical mosaic Visiting residents of another planet
Basova Svetlana Vladimirovna mathematics teacher Yuzhno-Dubrovinskaya SOSHarmizonsky district, Tyumen region. Number...
0 2k 0September 5, 2011