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dung cong » dung trong
hien anh » hien hanh, thien anh, dien anh
bang cua » ban cua, mang cua, hang cua
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cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan cau » toan cao, toan ban, toan tap
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