catenae(or catenas), catenations, chains, consecutions, nexuses(or nexus), progressions, sequences, strings, trains
chain reactionsbelts, circles, cycles, vicious circles(also vicious cycles)continua(also continuums), gamuts, gauntlets(also gantlets), scales, spectra(or spectrums)flows, rivers, streamsfiles, lines, queues, ranges, rows, successions