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khoa hoc » hoa hoc
cac khoa » cac khoan, cac khoi, dac khoa
tu sach » thu sach, su sach, te sach
sach xa » sach dao, sach nha, sach bai
cac khi » cac khoi, cac khu, cac thi
khi hoc » khi hoi, khien hoc, thai hoc
bai cac » tai cac, bai ca, vai cac
xa cac » va cac, ca cac, xa cao
su cac » tu cac, su cao, su can
khoa hoc » hoa hoc
cac khoa » cac khoan, cac khoi, dac khoa
tu sach » thu sach, su sach, te sach
sach xa » sach dao, sach nha, sach bai
cac khi » cac khoi, cac khu, cac thi
khi hoc » khi hoi, khien hoc, thai hoc
bai cac » tai cac, bai ca, vai cac
xa cac » va cac, ca cac, xa cao
su cac » tu cac, su cao, su can
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