Kuwala kwathu kumathamangitsidwa dongosolo lamphamvu lomwe limatsimikizira kuti mtengowo umakhala wolinganiza molondola, kusintha kusintha kusintha kwa katundu kapena misewu. Izi zimathandiza kuti zikhale zotetezeka komanso zotonthoza, chifukwa kuwunika kumakhalabe kosalekeza, mosamala, ngakhale zili choncho.