1. Sistimi e thibelang moea, ha e hloke ho lula e ntse e phahama,
2. Lintho tse sa keneleng metsi, tšireletso ea UV, e hanyetsanang le lelakabe
3.Ho na le li-valve tse sireletsehileng tsa khatello e phahameng, li fana ka ts'ebeliso e sireletsehileng ho uena