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hoc trien » hoc tren, hoc tien, hoc truyen
tinh hoc » sinh hoc, tin hoc, hinh hoc
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
khoa hoc » hoa hoc
tu tinh » tru tinh, tu tin, thue tinh
phat va » chat va, pham va, phat vi
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hoc xa » hoc ma
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