-er -ic c-- ccc cce cci cco ccr ccs ce- cec cee cei ceo ceq cer ces ci- cic cie cii cio ciq cir cis co- coc coe coi coo coq cor cos cqc cqi cqo cqs crc cre cri cro crq crr crs csc cse csi cso csq csr css ec- ecc ece eci eco ecq ecr ecs eec eee eeo eer ees eic eie eii eio eir eis eo- eoc eoe eoi eoo eoq eor eos eqe eqq eqs erc ere eri ero erq err ers es- esc ese esi eso esq esr ess icc ice ici ico icq icr ics ie- iec iee iei ier ies iic iie iii iio iir iis io- ioc ioe ioi ioo ior ios iqc iqe iqs ir- irc ire iri iro irq irr irs is- isc ise isi iso isq isr iss o-i oc- occ oci oco ocr ocs oec oee oei oeo oer oes oic oie oii oio oir ois oo- ooc ooi ooo oor oos oqo or- orc ore ori oro orr ors os- osc ose osi oso osq osr oss qcc qci qco qcs qec qee qeo qic qie qio qir qis qoi qoo qor qos qqq qrc qre qri qrs qsc qsi qso qsr rcc rce rci rco rcr rcs re- rec ree rei reo req rer res ric rie rii rio riq rir ris roc roe roi roo ror ros rqc rqs rrc rri rrq rrr rrs rsc rse rsi rso rsq rsr rss scc sce sci sco scr scs se- sec see sei seo seq ser ses sic sie sii sio siq sir sis soc soe soi soo soq sor sos sqi sqq sqr sqs sr- src sre sri sro srq srr srs ss- ssc sse ssi sso ssq ssr sss