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thuoc sinh » hoc sinh, thu sinh, thuoc sach
khoa thong » hoa thong, thoai thong, pho thong
hanh khoa » hang khoa, anh khoa, hanh hoa
khoa khoa » hoa khoa, khuan khoa, khoa hoc
hoc sach » hoc sinh, hoc cac, hoc anh
sach dai » sach dao, sach bai, sach dat
dai thuc » dan thuc, dai thu, dai thua
sinh dat » sinh vat, dinh dat, sinh dai
thu hanh » thu thanh, thuy hanh, thi hanh
dat thu » dat phu, sat thuc, dat tieu
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