Ifeni ephathwayo yifeni ehambayo enomthamo ophezulu. Kwezinye iindawo ezithile, ifeni yesilingi yeHVLS ayinakufakwa phezulu ngenxa yendawo encinci, iMDM sisisombululo esifanelekileyo, imveliso ifanelekile kwiindlela ezimxinwa, uphahla oluphantsi, iindawo zokusebenza ezixineneyo, okanye iindawo ezinomthamo othile womoya.