Tuubooyinka kala duwan ee khadadka badan leh ee cadaadiska sare leh waxaa loo isticmaalaa in lagu xiro laba cutub oo qalab haydarooliga ah, inta badan cutubyada kala qaybiya: cutubyada waxqabadka iyo xakamaynta ee loo isticmaalo in lagu xakameeyo qaybaha ku xiga ee daboollada farsamaysan. Waxay u oggolaanayaan inay si fog u diraan kicinta xakamaynta inta u dhaxaysa cutubyada xakamaynta iyo fulinta.