16) infra- (below in a range, beyond) infrastructure , infrared

　　17) re- (again, back to a former state) react, reaction, recall, recede , receipt, recipient , reclaim , recognize, recognition, record, recorder, recover, recovery, recreation, recur , recycle , redundant , reflect, reflection, reflexion, reform, refrain , refresh, refreshment , refund , refute , reinforce, reject, remember, remind, removal, remove, renaissance , renew, repay , repeat, repeatedly, repel , repetition, replace, replacement, reply, report, reporter, represent, representative, repression , reproduce, respect, respond, response, responsibility, responsible, restore, resume, return, reunion , reuse, review, revise, revive, revolt, revolution, revolutionary, revolve, reward

　　18) co-, col-, com-, con-, cor- (with together) co-existence, cooperate, cooperative , co-author, coalition , coherent , coincide , coincidence , collaboration , colleague, collide , collision, collocation, compassion, compassionate, concentric, confederation, conjoin, coordinate, correlate, correlation, correspond

　　19) inter- (between, among) international, interchange, interchangeable, interdependent, interpersonal, interview, interact , interaction, intercourse , interface , interfere, interference, Internet, interrupt, interval, intervene

　　20) macro- (large) macroeconomics , macrocosm , macrostructure

　　21) micro- (extremely small) microcomputer, microeconomics , microscope, microphone, microsurgery, microelectronics, microbiologist

　　22) super- (greater or more than) super, supermarket, supersonic , superman, superpower, supernatural, supervise , superb, superficial, superintendent , superior, superiority , supreme, supersystem

　　23) sur- (more than, beyond) surplus, surtax, surface, surpass , surround, survival, survive, suspect

　　24) ultra- (beyond, very, too) ultramodern, ultrasound, ultra-violet

　　25) auto- (of or by oneself) auto, autocriticism, autoland, automobile, automation , automatic, autobiography , autonomous , autonomy

　　26) mal- (bad, badly) malfunction, maltreat , malnutrition , malpractice

　　27) tele- (at or over a long distance, by or for television) telegram, television, telegraph, telephone, telecommunications , telescope, telescreen, teleswitch, televise

　　28) semi-, hemi- (half) semicircle, semiconductor, semi-colony , semifinal, hemisphere

　　29) uni-, mono- (one) uniform, unify , union, unique, unit, unite, unity, universe, universal, university, monologue , monoplane, monopoly , monotone, monotonous , carbon monoxide

　　30) bi-, di- (two) biweekly, bicycle, bilateral , billion, bilingual, dialogue, carbon dioxide

　　31) tri- (three) tricycle , triangle, triangular, trilogy , triple, trigonometry

　　32) quadri-, quadru- (four) quadruple, quadrangle

　　33) penta- (five) pentagon, Pentagon, Pentium

　　34) hexa- (six) hexagon, hexangular

　　35) sept- (seven) September, Sept-Wolves

　　36) octa- (eight) octagon, octave, octopus, October