-er -ic c-- ccc ccd cce cci cck cco ccp ccr ccs cdc cdd cde cdi cdk cdo cdp cdr cds ce- cec ced cee cei cek ceo cep cer ces ci- cic cid cie cii cik cio cip cir cis ckc ckd cki cko cks co- coc cod coe coi cok coo cop cor cos cpc cpd cpe cpi cpk cpo cpp cpr cps crc crd cre cri crk cro crp crr crs csc csd cse csi csk cso csp csr css dcc dcd dce dci dck dco dcp dcr dcs ddc ddd dde ddi ddk ddo ddp ddr dds de- dec ded dee dei dek deo dep der des di- dic did die dii dik dio dip dir dis dkc dke dki dkk dko dkp dkr dks doc dod doe doi dok doo dop dor dos dpc dpd dpe dpi dpk dpo dpp dpr dps drc drd dre dri drk dro drp drr drs dsc dsd dse dsi dsk dso dsp dsr dss ec- ecc ecd ece eci eck eco ecr ecs ed- edc edd ede edi edk edo edp edr eds eec eed eee eek eeo eep eer ees eic eid eie eii eik eio eip eir eis ekc ekd eke eki eko ekp ekr eks eo- eoc eod eoe eoi eok eoo eop eor eos ep- epc epd epe epi epo epp epr eps erc erd ere eri erk ero erp err ers es- esc esd ese esi esk eso esp esr ess i-d icc icd ice ici ick ico icp icr ics idc idd ide idi idk ido idp idr ids ie- iec ied iee iei iek iep ier ies iic iid iie iii iio iip iir iis ikc ike iki ikk iko ikr iks io- ioc iod ioe ioi ioo iop ior ios ipc ipd ipe ipi ipo ipp ipr ips ir- irc ird ire iri irk iro irp irr irs is- isc isd ise isi isk iso isp isr iss kcc kcd kce kci kck kcp kcr kcs kdc kde kdk kdo kdp kdr kds ke- kec ked kee kei kek keo kep ker kes kic kid kie kii kik kio kip kir kis kkc kke kki kkk kkp kkr kks koc kod koe koi kok koo kop kor kos kpc kpd kpe kpi kpk kpo kpp kpr kps krc krd kri krk kro krp krr krs ksc ksd kse ksi ksk kso ksp ksr kss o-i oc- occ ocd oci ock oco ocp ocr ocs odc odd ode odi odo odp odr ods oec oed oee oei oeo oep oer oes oic oid oie oii oik oio oip oir ois okc okd oke oki okk oko okp okr oks oo- ooc ood ooi ook ooo oop oor oos op- opc opd ope opi opk opo opp opr ops or- orc ord ore ori ork oro orp orr ors os- osc osd ose osi osk oso osp osr oss p-p pcc pcd pce pci pck pco pcp pcr pcs pdc pdd pde pdi pdk pdo pdp pdr pds pec ped pee pei pek peo pep per pes pic pid pie pii pik pio pip pir pis pkc pkd pke pki pko pkp pkr pks poc pod poe poi pok poo pop por pos ppc ppd ppe ppi ppk ppo ppp ppr pps prc prd pre pri prk pro prp prr prs ps- psc psd pse psi psk pso psp psr pss rcc rcd rce rci rco rcp rcr rcs rdc rdd rde rdi rdo rdp rdr rds re- rec red ree rei rek reo rep rer res ric rid rie rii rik rio rip rir ris rkc rke rkk rko rkp rks roc rod roe roi rok roo rop ror ros rpc rpd rpe rpi rpk rpo rpp rpr rps rrc rrd rri rrk rrp rrr rrs rsc rsd rse rsi rsk rso rsp rsr rss scc scd sce sci sck sco scp scr scs sdc sdd sde sdi sdk sdo sdp sdr sds se- sec sed see sei sek seo sep ser ses sic sid sie sii sik sio sip sir sis sk- skc skd ske ski skk sko skp skr sks soc sod soe soi sok soo sop sor sos spc spd spe spi spk spo spp spr sps sr- src srd sre sri srk sro srp srr srs ss- ssc ssd sse ssi ssk sso ssp ssr sss