UC bearing na-ezo aka na mpụta okirikiri.Igwe bọọlụ dị n'elu dị n'elu bụ n'ezie ụdị dị iche iche nke ịgba bọọlụ miri emi, nke e ji mara dayameta mpụta nke mgbanaka mpụta bụ okirikiri, nke enwere ike itinye n'ime oghere concave kwekọrọ nke oche oche iji rụọ ọrụ nke onwe. nhazi.
Ụdị ngwaahịa: mpụta okirikiri ibu.Ngwa ngwaahịa: igwe na-ebu ígwè + nkedo ocheNhazi ngwaahịa: oche square, oche kwụ ọtọ, oche diamond, T - oche oche na ihe ndị ọzọ.Atụmatụ: elu nkenke, ogologo ndụ, obere mkpọtụ.