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khoa thong » hoa thong, thoai thong, pho thong
khoa khoa » hoa khoa, khuan khoa, khoa hoc
sach tai » sach bai, sach tham, sach dao
tu sach » thu sach, su sach, te sach
tam cac » tai cac, tap cac, tao cac
nam cac » nam cao, nam sach
tai tac » tai cac, tai tao, thi tac
lo khoa » lao khoa, ly khoa, von khoa
khoa he » hoa he, khoa hoc, khong he
tac lo » tac co, oac lo, tac so
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