Sikirini
Ma ulusi amapangidwa nthawi zambiri kuchokera ku zida zamtundu wapamwamba, zomwe zimasankhidwa kutengera zomwe zimafunidwa pakugwiritsa ntchito mosiyanasiyana pokhudzana ndi mphamvu, kulimba, komanso kukana dzimbiri. Chitsulo cha kaboni ndi chimodzi mwazinthu zofala kwambiri, makamaka m'makalasi monga 4.8, 8.8, ndi 10.9.