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nghien thu » nghiem thuc, nghiep thuc, nghien cuu
cac thoi » cac toi, cac hop, cac tro
thoi tap » toi tap, hoc tap, thoi dai
hoc toan » hoc tan, hoa toan, hoc than
hop toan » hop hoan, phap toan, tap toan
hoat hoc » hoa hoc, hoat ho, khoa hoc
gian dan » gian lang
va gian » va gianh, van gian, va giai
hoc xa » hoc ma
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