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The requested URL /de-bai-giai-hoat-dong-hinh-thanh-phat-trien-nang-luc-van-dung-kien-thuc-va-ki-nang-trang-17-bai-3-sgk-tu-nhien-va-xa-hoi-lop-2-chan-troi-sang-tao/ was not found on this server.
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