Raws li qhov sib txawv ntawm qhov hluav taws kub ntawm cov qhov rooj hluav taws, lawv cov hluav taws kub tuaj yeem muab faib ua peb qib: A, B, thiab c. Hlau qhov rooj hluav taws ntawm cov qib sib txawv tuaj yeem siv rau ntau qhov chaw.

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