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thuoc sinh » hoc sinh, thu sinh, thuoc sach
ban thuoc » dang thuoc, cay thuoc, nam thuoc
sinh khoa » sinh hoc, sinh hoat, anh khoa
hang khoa » dung khoa
sach ban » sach bai, sach han, sach bac
so sach » so sanh, bo sach, co sach
khoa he » hoa he, khoa hoc, khong he
sach va » sach xa, sach ha, sach dao
tu hang » thu hang, tu hanh, tu hung
va tu » va su
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