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truc thuoc » thuc thuc, tri thuoc, tu thuoc
thuoc sach » hoc sach, nuoc sach, thuat sach
sach truc » cach thuc, sach tren, sach thu
khong he » khong khi, hong ha, khong _
khoa hoc » hoa hoc
te sach » toc sach
khoa he » hoa he, khoa thu, khoa hoi
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