Tom qab kuaj tas, txoj kab tsim khoom tshiab rau iav fwj thiab cov rhawv zeb pib tsim tawm tam sim no, tom qab ntawd cov iav fwj iav thiab cov rhawv zeb ntau qib txo mus txog ib ncig 4 lub lis piam.
Cov khoom lag luam:
Ntxiv-flint iav fwj rau dab
Flint iav fwj/rhawv zeb rau khoom noj thiab dej haus
Xim xim iav fwj/lub rhawv zeb rau lub tsev muag tshuaj thiab tshuaj pleev ib ce
