Cov qhov rooj hluav taws yog siv tshwj xeeb los cais qhov hluav taws kub hauv kev tsim vaj tsev. Thaum muaj hluav taws kub, tib neeg tuaj yeem tau txais txoj hauv kev khiav los ntawm qhov rooj hluav taws.

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