Nau'in nau'in Amurka cikakken tsawaita tura-zuwa-buɗe nunin faifan ɗora daga ƙarƙashin dutsen faifan ɗorawa na ɗorewa na siyarwar zafi mai zafi a cikin Turai da ƙasashen Amurka. Yana da wani makawa sashe na zamani kabad. An tsara ɓangaren farko na waƙar don ɗaukar kowane tasiri, don haka rage lalacewa ko haɗarin rauni.