-er a-a a-c aaa aac aad aae aak aao aap aar aas ac- aca acc acd ace ack aco acp acr acs ad- ada adc add ade adk ado adp adr ads aea aec aed aee aek aeo aep aer aes aka akc akd ake akk ako akp akr aks aoa aoc aod aoe aok aoo aop aor aos ap- apa apc apd ape apk apo app apr aps ar- ara arc ard are ark aro arp arr ars as- asa asc asd ase ask aso asp asr ass c-- caa cac cad cae cak cao cap car cas cca ccc ccd cce cck cco ccp ccr ccs cda cdc cdd cde cdk cdo cdp cdr cds ce- cea cec ced cee cek ceo cep cer ces cka ckc ckd cko cks co- coa coc cod coe cok coo cop cor cos cpa cpc cpd cpe cpk cpo cpp cpr cps cra crc crd cre crk cro crp crr crs csa csc csd cse csk cso csp csr css daa dac dad dae dak dao dap dar das dca dcc dcd dce dck dco dcp dcr dcs dda ddc ddd dde ddk ddo ddp ddr dds de- dea dec ded dee dek deo dep der des dka dkc dke dkk dko dkp dkr dks doa doc dod doe dok doo dop dor dos dpa dpc dpd dpe dpk dpo dpp dpr dps dra drc drd dre drk dro drp drr drs dsa dsc dsd dse dsk dso dsp dsr dss eaa eac ead eae eak eao eap ear eas ec- eca ecc ecd ece eck eco ecr ecs ed- eda edc edd ede edk edo edp edr eds eea eec eed eee eek eeo eep eer ees eka ekc ekd eke eko ekp ekr eks eo- eoa eoc eod eoe eok eoo eop eor eos ep- epa epc epd epe epo epp epr eps era erc erd ere erk ero erp err ers es- esa esc esd ese esk eso esp esr ess ka- kaa kac kad kae kak kao kap kar kas kca kcc kcd kce kck kcp kcr kcs kda kdc kde kdk kdo kdp kdr kds ke- kea kec ked kee kek keo kep ker kes kkc kke kkk kkp kkr kks koa koc kod koe kok koo kop kor kos kpa kpc kpd kpe kpk kpo kpp kpr kps kra krc krd krk kro krp krr krs ksa ksc ksd kse ksk kso ksp ksr kss oaa oac oad oae oak oao oap oar oas oc- oca occ ocd ock oco ocp ocr ocs oda odc odd ode odo odp odr ods oea oec oed oee oeo oep oer oes oka okc okd oke okk oko okp okr oks oo- ooa ooc ood ook ooo oop oor oos op- opa opc opd ope opk opo opp opr ops or- ora orc ord ore ork oro orp orr ors os- osa osc osd ose osk oso osp osr oss p-p paa pac pad pae pak pao pap par pas pca pcc pcd pce pck pco pcp pcr pcs pda pdc pdd pde pdk pdo pdp pdr pds pea pec ped pee pek peo pep per pes pka pkc pkd pke pko pkp pkr pks poa poc pod poe pok poo pop por pos ppa ppc ppd ppe ppk ppo ppp ppr pps pra prc prd pre prk pro prp prr prs ps- psa psc psd pse psk pso psp psr pss ra- raa rac rad rae rak rao rap rar ras rca rcc rcd rce rco rcp rcr rcs rda rdc rdd rde rdo rdp rdr rds re- rea rec red ree rek reo rep rer res rkc rke rkk rko rkp rks roa roc rod roe rok roo rop ror ros rpa rpc rpd rpe rpk rpo rpp rpr rps rra rrc rrd rrk rrp rrr rrs rsa rsc rsd rse rsk rso rsp rsr rss saa sac sad sae sak sao sap sar sas sca scc scd sce sck sco scp scr scs sda sdc sdd sde sdk sdo sdp sdr sds se- sea sec sed see sek seo sep ser ses sk- ska skc skd ske skk sko skp skr sks soa soc sod soe sok soo sop sor sos spa spc spd spe spk spo spp spr sps sr- sra src srd sre srk sro srp srr srs ss- ssa ssc ssd sse ssk sso ssp ssr sss