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san khoa » toan khoa, hang khoa, da khoa
khoa hoc » hoa hoc
tu sinh » thu sinh, tuc sinh, tu minh
cuu mot » cua mot, cuu mo, huu mot
mot hoc » mon hoc, mo hoc, mot goc
hoc san » hoc dan, toc san, hoc can
phat va » chat va, pham va, phat vi
phap va » phap vat, pham va, pham van
hoc xa » hoc ma
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