Enwere ike kewaa ọnụ ụzọ ọnụ ụzọ ọkụ ọkụ n’ime ụzọ atọ: otu ọnụ ụzọ, ọnụ ụzọ abụọ na ọnụ ụzọ anọ. Dabere na ọnụ ụzọ ọkụ nchara Grade A, oge nguzogide ọkụ nwere ike iru nkeji 90.

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