Txhawm rau kom yooj yim cov txheej txheem ntxuav cov daus, cov tsim qauv hloov kho cov qauv ntawm lub duav. Lub log txuas nrog cov cuab yeej siv ntawm phau ntawv, ntawm cov nuj nqis uas lub nra ntawm sab nraub qaum yog txo thiab cov khoom lag luam ntawm kev ntxuav kom nce.
Piv rau cov pa yaj phom, tsim cov daus tshiab ua rau koj khib cov daus 3 zaug sai dua, cov ntsiab lus txias ". Rau yooj yim ntawm cia daus hma folds. Tus nqi ntawm lub duav yog 139 daus las.
