-er -ic c-- ccc cce cci cco ccr ccs ccu ce- cec cee cei ceo cer ces ceu ci- cic cie cii cio cir cis ciu co- coc coe coi coo cor cos cou crc cre cri cro crr crs cru csc cse csi cso csr css csu cuc cue cui cuo cur cus cuu ec- ecc ece eci eco ecr ecs ecu eec eee eeo eer ees eic eie eii eio eir eis eiu eo- eoc eoe eoi eoo eor eos eou erc ere eri ero err ers eru es- esc ese esi eso esr ess esu eu- euc eue eui eur eus icc ice ici ico icr ics icu ie- iec iee iei ier ies iic iie iii iio iir iis iiu io- ioc ioe ioi ioo ior ios iou ir- irc ire iri iro irr irs iru is- isc ise isi iso isr iss isu iu- iuc iue iui iur ius o-i oc- occ oci oco ocr ocs ocu oec oee oei oeo oer oes oic oie oii oio oir ois oiu oo- ooc ooi ooo oor oos or- orc ore ori oro orr ors oru os- osc ose osi oso osr oss osu ou- ouc oue oui ouo our ous rcc rce rci rco rcr rcs rcu re- rec ree rei reo rer res reu ric rie rii rio rir ris roc roe roi roo ror ros rou rrc rri rrr rrs rru rsc rse rsi rso rsr rss rsu ruc rue rui ruo rur rus ruu scc sce sci sco scr scs scu se- sec see sei seo ser ses seu sic sie sii sio sir sis siu soc soe soi soo sor sos sou sr- src sre sri sro srr srs ss- ssc sse ssi sso ssr sss ssu suc sue sui suo sur sus suu ucc uce uci uco ucr ucs ucu uec uee uei uer ues uic uie uii uio uir uis uiu uoc uoe uoo uor uos ur- urc ure uri uro urr urs uru usc use usi uso usr uss usu uuc uue uur uus uuu