Ngwongwo ngwucha na-enwekarị isi, ọkwa anọ, nnukwu efere na-agbakọba na ụkwụ, a na-enwekarị ntinye ndụdụ, ntupu waya, oche nchara, ma ọ bụ ogwe osisi.
Ndokọba ihe na wiil bụ ụdị nke a na-ahụkarị stackable racking racking na wheel, nke dị mma maka ịkwagharị.