Ndina-N'ihe ndina
Sistemu akwa akwa na-enye nhọrọ iji megharịa ọrụ nke akwa nlekọta nọọsụ n'ime etiti akwa akwa.Usoro ihe ndina n'ihe ndina na-enye elu ala ịgha ụgha na-agbanwe agbanwe, nke a ga-etinye n'ime ihe ndina dị adị na-edochi okpokolo agba agba agba.Nke a na-enyere aka ịrụ ọrụ akwa nlekọta nọọsụ ka ọ banye n'ime arịa ụlọ a ma ama.