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thuoc sinh » hoc sinh, thu sinh
thuoc sach » hoc sach, nuoc sach, thuat sach
sach trien » sach tien, sach tren, sach thieu
trien thuc » trien thuoc, tren thuc, trien thuat
thu thuoc » tu thuoc, thu thuc, tru thuoc
cach thu » cach thuc, cac thu, cach tu
thuc dan » thuc hanh, hoc dan, thuc vat
dan khoa » dang khoa, da khoa, san khoa
tu cach » tu cac
khoa he » hoa he, khoa hoc, khong he
hoc he » hoc hien
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