Chain

link=//upload.wikimedia.org/wikipedia/commons/thumb/8/88/Kettenvergleich.jpg/220px-Kettenvergleich.jpg|thumb|Akara ndị na-agbagharị agbagharị
A chain bụ usoro nchịkọta nke ihe ndị ejikọrọ, a na-akpọ njikọ, nke a na-ejikarị ígwè eme, nke nwere njirimara zuru oke yiri nke eriri na ihi na ọ na-agbanwe agbanwe ma gbagọrọ agbagọ na mkpakọ ma na-aga na ahịrị, siri ike, na ibu na-ebu ibu na nrụgide. Akara nwere ike ịnwe njikọ abụọ ma ọ bụ karịa. Enwere ike ịkewa agbụ site na nhazi ha, nke enwere ike isi site na ojiji ha: