3. Mesh ee saxanka dahaarka biraha u kala qaybiyaa shaashadda birta ah ee dusha mesh oo badan oo madax banaan, kaas oo ka hortagi kara balaadhinta xad-dhaaf ah ee dhaawac deegaanka. Isla mar ahaantaana, waxaa lagu qalabeeyaa caag gaar ah si loo hagaajiyo dusha mesh ee burburay, kaas oo badbaadin kara wakhti yarna kharashka isticmaalka.
Shirkaddayadu waxay leedahay waayo-aragnimo wax-soo-saar qani ah iyo tignoolajiyada qaan-gaadhka ah waxayna soo saari kartaa tilmaamo kala duwan oo ah shaashado gariir fidsan iyadoo loo eegayo baahida macaamiisha kala duwan.