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tan khoa » toan khoa, tran khoa, san khoa
khoa hoc » hoa hoc
dan nhan » danh nhan, dan chan, van nhan
cac hoc » cach hoc, cac hop, bac hoc
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
hoc tan » hoc dan, hoc tai, hoc can
hoi dan » hoa dan, hoc dan, hoi dap
nhan va » nhan tai, nhan dan, nhan tao
hoc xa » hoc ma
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