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tinh van » trinh van, dinh van, tinh va
sach hoc » cach hoc, sach hoi, mach hoc
khoa hoc » hoa hoc
san khoa » toan khoa, hang khoa, da khoa
hoc san » hoc dan, toc san, hoc can
cuu mot » cua mot, huu mot, cuu vuot
tu sach » thu sach, su sach, te sach
hoc xa » hoc ma
so cuu » so huu, so cau, so chu
ho cuu » ho chu, ho cua, khao cuu
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