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sach hoc » cach hoc, sach hoi, mach hoc
dan khoa » dang khoa, da khoa, san khoa
khoa hoc » hoa hoc
tu sach » thu sach, su sach, te sach
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
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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