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cach thoi » cac thoi, cach thuc, cach noi
thoi tap » toi tap, hoc tap, thoi dai
dong hoc » dong co, dong luc
khoa hoc » hoa hoc
can phan » van phan, cac phan, can chan
phan van » pham van, thanh van, luan van
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mon hoc » toan hoc
voi can » voi cac, voi cong, voi hang
ma voi » ba voi, da voi, ma moi