-er -ic c-- ccc ccd cce cci cck ccr ccs cdc cdd cde cdi cdk cdr cds ce- cec ced cee cei cek cer ces ci- cic cid cie cii cik cir cis ckc ckd cki cks crc crd cre cri crk crr crs csc csd cse csi csk csr css dcc dcd dce dci dck dcr dcs ddc ddd dde ddi ddk ddr dds de- dec ded dee dei dek der des di- dic did die dii dik dir dis dkc dke dki dkk dkr dks drc drd dre dri drk drr drs dsc dsd dse dsi dsk dsr dss ec- ecc ecd ece eci eck ecr ecs ed- edc edd ede edi edk edr eds eec eed eee eek eer ees eic eid eie eii eik eir eis ekc ekd eke eki ekr eks erc erd ere eri erk err ers es- esc esd ese esi esk esr ess i-d icc icd ice ici ick icr ics idc idd ide idi idk idr ids ie- iec ied iee iei iek ier ies iic iid iie iii iir iis ikc ike iki ikk ikr iks ir- irc ird ire iri irk irr irs is- isc isd ise isi isk isr iss kcc kcd kce kci kck kcr kcs kdc kde kdk kdr kds ke- kec ked kee kei kek ker kes kic kid kie kii kik kir kis kkc kke kki kkk kkr kks krc krd kri krk krr krs ksc ksd kse ksi ksk ksr kss rcc rcd rce rci rcr rcs rdc rdd rde rdi rdr rds re- rec red ree rei rek rer res ric rid rie rii rik rir ris rkc rke rkk rks rrc rrd rri rrk rrr rrs rsc rsd rse rsi rsk rsr rss scc scd sce sci sck scr scs sdc sdd sde sdi sdk sdr sds se- sec sed see sei sek ser ses sic sid sie sii sik sir sis sk- skc skd ske ski skk skr sks sr- src srd sre sri srk srr srs ss- ssc ssd sse ssi ssk ssr sss