Dabere n'ofe akụkụ billet, a na-ekewakarị ha na Square billlets (billet akụkụ anọ): obere mpempe akwụkwọ mpempe akwụkwọ, nnukwu mpempe akwụkwọ mpịakọta gburugburu: obere mpempe akwụkwọ, nnukwu akwụkwọ mpịakọta, oghere oghere Slabs: obere slabs (flat slabs), mgbe niile. slabs, obosara na nke gbara ọkpụrụkpụ, mkpara...
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