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sach hoc » cach hoc, sach hoi, mach hoc
khoa hoc » hoa hoc
cuu mot » cua mot, cuu mo, huu mot
hoc san » toc san, hoc can, hoc tan
tinh va » tich va, trinh van, trinh vat
hoc xa » hoc ma
so cuu » so huu, ho cuu, so cau
xa so » ma so, va so, ka so
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