Ihe owuwu ahụ dị ọkụ ma dị mfe ịwụnye, dabara maka obere mpaghara nke akụkụ nnyefe.Ebe etiti etiti oghere abụọ ahụ dabara na etiti etiti nke oghere oche diagonal nke otu ụdị.
Ngwa isi UCFL: ntinye nke obere oghere nke igwe, ihe na-ebu ibu, igwe nri, igwe ọgwụ, wdg.