Cov nplooj ntawv hluav taws kub raws li nyias tuab tuaj yeem muab faib ua a, B, C thiab D peb qhov tshwj xeeb, qhov siab dua qhov tshwj xeeb, qhov hluav taws kub qhov rooj txo qis, cov hluav taws kub rwb thaiv tsev muaj zog dua.

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