Valvụ urukurubụba Grooved Ọgwụgwụ
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Valvụ urukurubụba nke e ji nwayọọ nwayọọ mechie
GỤKWUOValvụ urukurubụba nke e ji eriri mee bụ valvụ urukurubụba nke e ji eriri mee nke nwere njirimara mmiri pụrụ iche. A na-akpụ akara rọba ahụ n'elu diski ígwè ductile, iji mee ka o kwe omume ịnweta mmiri kachasị elu.
