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thanh tung » thanh cong
cua thong » cua thuong, cua khong, cua tong
thong tac » thong cac, tuong tac, thong tai
tung cua » trung cua, tuong cua, dung cua
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
so cuu » so huu, ho cuu, so cau
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