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cach hoc » cach thuc, cach thoi, dich hoc
dan khoa » dang khoa, da khoa, san khoa
khoa hoc » hoa hoc
van nhan » van phan, van thanh, danh nhan
tu cach » tu cac
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
va nhan » ca nhan, va phan, va nha
hoc xa » hoc ma