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hoc thong » hoc thuong, hoc trong, hoc hong
sach tren » sach tien, sach tranh
tren thuc » trien thuc, tron thuc, trinh thuc
hanh khoa » hang khoa, anh khoa, hanh hoa
hoc tieng » hoc hien
dac khoa » da khoa, dai khoa, dau khoa
khoa hoc » hoa hoc
tu sach » thu sach, su sach, tu cach
tren tu » tren tau, tran tu, tre tu
te sach » toc sach
tu dac » thu dac, tu cac, tu dat
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