Lub sijhawm tiv thaiv hluav taws ntawm lub qhov rooj hluav taws yog txiav txim siab los ntawm lub rooj tsavxwm hluav taws. Nyob rau hauv qhov kev hwm no, lub rooj tsav xwm hluav taws siv los ntawm chav kawm A qhov rooj hluav taws feem ntau zoo dua li lub rooj tsav hluav taws uas siv los ntawm chav kawm B hluav taws, yog li qhov kev ua tau zoo tag nrho zoo dua li chav kawm B hluav taws.

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