Ihe dị iche n’etiti nkwụsị ọkụ ọkụ nke ọnụ ụzọ ọkụ: a na-ekewa ọnụ ụzọ ọkụ ọkụ n’ime A, B, C, nke bụ nkwụsị ọkụ ọkụ nke ọnụ ụzọ ọkụ ahụ, ya bụ, oge nkwụsị ọkụ, ụkpụrụ dị ugbu a bụ mgbochi ọkụ. oge erughị awa 1.5, Klas B abụghị ihe na-erughị awa 1.0, Klas C abụghị ihe na-erughị awa 0.6.

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