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cuu toan » cuu hoan, cua toan, huu toan
khoa hoc » hoa hoc
te sinh » ve sinh, he sinh, ke sinh
hoc tan » hoc tang, hoc dan, hoc can
hoc tai » hoc dai, hoc bai, hoc giai
va phap » va phat, ban phap
phap va » phap vat, pham va, pham van
hoc xa » hoc ma
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