-er -ic c-- ccc cce cci cco ccr ccs ccv ce- cec cee cei ceo cer ces cev ci- cic cie cii cio cir cis civ co- coc coe coi coo cor cos cov crc cre cri cro crr crs crv csc cse csi cso csr css csv cvc cve cvi cvo cvr cvs cvv ec- ecc ece eci eco ecr ecs ecv eec eee eeo eer ees eev eic eie eii eio eir eis eiv eo- eoc eoe eoi eoo eor eos erc ere eri ero err ers erv es- esc ese esi eso esr ess esv evc eve evi evo evr evs evv i-v icc ice ici ico icr ics icv ie- iec iee iei ier ies iev iic iie iii iio iir iis io- ioc ioe ioi ioo ior ios iov ir- irc ire iri iro irr irs irv is- isc ise isi iso isr iss isv ivc ive ivi ivo ivr ivs ivv o-i oc- occ oci oco ocr ocs ocv oec oee oei oeo oer oes oic oie oii oio oir ois oiv oo- ooc ooi ooo oor oos oov or- orc ore ori oro orr ors orv os- osc ose osi oso osr oss osv ov- ovc ove ovi ovo ovs ovv rcc rce rci rco rcr rcs rcv re- rec ree rei reo rer res rev ric rie rii rio rir ris riv roc roe roi roo ror ros rov rrc rri rrr rrs rsc rse rsi rso rsr rss rsv rvc rve rvi rvo rvr rvs rvv scc sce sci sco scr scs scv se- sec see sei seo ser ses sev sic sie sii sio sir sis siv soc soe soi soo sor sos sov sr- src sre sri sro srr srs srv ss- ssc sse ssi sso ssr sss ssv svc sve svi svo svr svs svv v-e vcc vce vci vco vcr vcs vec vee vei veo ver ves vi- vic vie vii vio vir vis viv voc voe voi voo vor vos vov vrc vre vri vrr vrs vsc vse vsi vso vsr vss vsv vvc vvi vvo vvr vvs vvv