-er a-a a-c a-t aaa aac aad aae aak aap aar aas aat ac- aca acc acd ace ack acp acr acs act ad- ada adc add ade adk adp adr ads adt aea aec aed aee aek aep aer aes aet aka akc akd ake akk akp akr aks ap- apa apc apd ape apk app apr aps apt ar- ara arc ard are ark arp arr ars art as- asa asc asd ase ask asp asr ass ast at- ata atc atd ate atp atr ats att c-- caa cac cad cae cak cap car cas cat cca ccc ccd cce cck ccp ccr ccs cct cda cdc cdd cde cdk cdp cdr cds cdt ce- cea cec ced cee cek cep cer ces cet cka ckc ckd cks ckt cpa cpc cpd cpe cpk cpp cpr cps cpt cra crc crd cre crk crp crr crs crt csa csc csd cse csk csp csr css cst cta ctc ctd cte ctk ctp ctr cts ctt daa dac dad dae dak dap dar das dat dca dcc dcd dce dck dcp dcr dcs dct dda ddc ddd dde ddk ddp ddr dds ddt de- dea dec ded dee dek dep der des det dka dkc dke dkk dkp dkr dks dkt dpa dpc dpd dpe dpk dpp dpr dps dpt dra drc drd dre drk drp drr drs drt dsa dsc dsd dse dsk dsp dsr dss dst dta dtc dtd dte dtk dtp dtr dts dtt eaa eac ead eae eak eap ear eas eat ec- eca ecc ecd ece eck ecr ecs ect ed- eda edc edd ede edk edp edr eds edt eea eec eed eee eek eep eer ees eet eka ekc ekd eke ekp ekr eks ekt ep- epa epc epd epe epp epr eps ept era erc erd ere erk erp err ers ert es- esa esc esd ese esk esp esr ess est eta etc etd ete etk etp etr ets ett k-t ka- kaa kac kad kae kak kap kar kas kat kca kcc kcd kce kck kcp kcr kcs kct kda kdc kde kdk kdp kdr kds kdt ke- kea kec ked kee kek kep ker kes ket kkc kke kkk kkp kkr kks kkt kpa kpc kpd kpe kpk kpp kpr kps kpt kra krc krd krk krp krr krs krt ksa ksc ksd kse ksk ksp ksr kss kst kta ktc kte ktk ktp ktr kts ktt p-p paa pac pad pae pak pap par pas pat pca pcc pcd pce pck pcp pcr pcs pct pda pdc pdd pde pdk pdp pdr pds pdt pea pec ped pee pek pep per pes pet pka pkc pkd pke pkp pkr pks pkt ppa ppc ppd ppe ppk ppp ppr pps ppt pra prc prd pre prk prp prr prs prt ps- psa psc psd pse psk psp psr pss pst pt- pta ptc ptd pte ptk ptp ptr pts ptt ra- raa rac rad rae rak rap rar ras rat rca rcc rcd rce rcp rcr rcs rct rda rdc rdd rde rdp rdr rds rdt re- rea rec red ree rek rep rer res ret rkc rke rkk rkp rks rkt rpa rpc rpd rpe rpk rpp rpr rps rpt rra rrc rrd rrk rrp rrr rrs rrt rsa rsc rsd rse rsk rsp rsr rss rst rta rtc rtd rte rtk rtp rtr rts rtt saa sac sad sae sak sap sar sas sat sca scc scd sce sck scp scr scs sct sda sdc sdd sde sdk sdp sdr sds sdt se- sea sec sed see sek sep ser ses set sk- ska skc skd ske skk skp skr sks skt spa spc spd spe spk spp spr sps spt sr- sra src srd sre srk srp srr srs srt ss- ssa ssc ssd sse ssk ssp ssr sss sst sta stc std ste stk stp str sts stt taa tac tad tae tak tap tar tas tat tca tcc tcd tce tck tcp tcr tcs tct tda tdc tdd tde tdk tdp tdr tds tdt te- tea tec ted tee tek tep ter tes tet tka tkc tke tkk tkp tkr tks tkt tpa tpc tpd tpe tpk tpp tpr tps tpt tra trc trd tre trk trp trr trs trt tsa tsc tsd tse tsk tsp tsr tss tst tta ttc ttd tte ttk ttp ttr tts ttt