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sach hoc » cach hoc, sach hoi, mach hoc
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
dan khoa » dang khoa, da khoa, san khoa
khoa hoc » hoa hoc
chu tinh » chau tinh, chua tinh, cuu tinh
su sach » so sach, vu sach
tinh va » tich va, trinh van, trinh vat
hoc xa » hoc ma
ho chu » hoi chu, cho chu, ho chua
xa ho » xa hoi, xa hoa, xa hoc
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