Yuav ua li cas kom paub meej tias cov txheej txheem ua raws li:
Xyuas seb tus qauv tom qab ntawm lub rooj tsavxwm puas muaj cov ntawv. Yog tsis muaj cov ntawv, nws yog ib qho txheej txheem txheem. Yog muaj cov ntawv, nws yog ib qho txheej txheem tshwj xeeb. Cov ntawv sib raug rau hom txheej txheem. Piv txwv li, MCTC-cOB-A1-Sz sib raug rau ib qho txheej txheem tshwj xeeb.