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khoa nganh » khoi nganh, hoc nganh
nganh nong » nganh cong
nong thong » nong thon, dong thong, cong thong
sach hoc » cach hoc, sach hoi, mach hoc
hoa khoa » khoa khoa, chua khoa, chia khoa
su sach » so sach, vu sach
cuu hoa » cuu khoa, cuu hoan, cau hoa
xay hoi » xa hoi, tay hoi, cay phoi
han va » hanh va, nhan va, ban va
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