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sach hoc » cach hoc, sach hoi, mach hoc
dan khoa » dang khoa, da khoa, san khoa
khoa hoc » hoa hoc
cua tinh » cua sinh, va tinh, ha tinh
tinh van » trinh van, dinh van, tinh va
tu sach » thu sach, su sach, te sach
cuu mot » cua mot, huu mot, cuu vuot
hoa cua » hoa chat, hoa xuat
hoc xa » hoc ma
xa hoa » xa khoa, xa hoi, ma hoa
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