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chu sinh » cho sinh, cuu sinh, chu dinh
cuu toan » cuu hoan, cua toan, huu toan
toan hoc » van hoc, hoa hoc, tin hoc
hoc toan » hoc tan, hop toan, hoa toan
khoa hoc » hoa hoc
hoi dan » hoa dan, hoc dan, hoi dap
hoc xa » hoc ma
ca van » cac van, cao van, can van
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