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khoa thong » hoa thong, thoai thong, pho thong
hoc thong » hoc thuong, hoc trong, hoc hong
sach khoa » bach khoa, sach nha, anh khoa
khoa khoa » hoa khoa, khuan khoa, hoc khoa
cach tri » cach thoi, cac tro, cach noi
khoa hoc » hoa hoc
cac thai » cac thoi, ca thai, cac thi
thai hoc » dai hoc, bai hoc, hoi hoc
hoc sach » hoc sinh, hoc cac, hoc anh
te sach » toc sach
tri te » tri tue, tri le, tri ve
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