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toan hoc » van hoc, hoa hoc, tin hoc
hoc toan » hoc tan, hop toan, hoa toan
khoa hoc » hoa hoc
phap dau » phan dau, phap day, pham dau
anh hoc » sinh hoc, benh hoc, hinh hoc
hoi ban » hoi dan, hoi bai, doi ban
do anh » do sanh, do danh
hoc xa » hoc ma
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