-er a-a a-c a-t aaa aac aad aae aak aao aar aas aat ac- aca acc acd ace ack aco acr acs act ad- ada adc add ade adk ado adr ads adt aea aec aed aee aek aeo aer aes aet aka akc akd ake akk ako akr aks aoa aoc aod aoe aok aoo aor aos aot ar- ara arc ard are ark aro arr ars art as- asa asc asd ase ask aso asr ass ast at- ata atc atd ate ato atr ats att c-- caa cac cad cae cak cao car cas cat cca ccc ccd cce cck cco ccr ccs cct cda cdc cdd cde cdk cdo cdr cds cdt ce- cea cec ced cee cek ceo cer ces cet cka ckc ckd cko cks ckt co- coa coc cod coe cok coo cor cos cot cra crc crd cre crk cro crr crs crt csa csc csd cse csk cso csr css cst cta ctc ctd cte ctk cto ctr cts ctt daa dac dad dae dak dao dar das dat dca dcc dcd dce dck dco dcr dcs dct dda ddc ddd dde ddk ddo ddr dds ddt de- dea dec ded dee dek deo der des det dka dkc dke dkk dko dkr dks dkt doa doc dod doe dok doo dor dos dot dra drc drd dre drk dro drr drs drt dsa dsc dsd dse dsk dso dsr dss dst dta dtc dtd dte dtk dto dtr dts dtt eaa eac ead eae eak eao ear eas eat ec- eca ecc ecd ece eck eco ecr ecs ect ed- eda edc edd ede edk edo edr eds edt eea eec eed eee eek eeo eer ees eet eka ekc ekd eke eko ekr eks ekt eo- eoa eoc eod eoe eok eoo eor eos eot era erc erd ere erk ero err ers ert es- esa esc esd ese esk eso esr ess est eta etc etd ete etk eto etr ets ett k-t ka- kaa kac kad kae kak kao kar kas kat kca kcc kcd kce kck kcr kcs kct kda kdc kde kdk kdo kdr kds kdt ke- kea kec ked kee kek keo ker kes ket kkc kke kkk kkr kks kkt koa koc kod koe kok koo kor kos kot kra krc krd krk kro krr krs krt ksa ksc ksd kse ksk kso ksr kss kst kta ktc kte ktk kto ktr kts ktt oaa oac oad oae oak oao oar oas oat oc- oca occ ocd ock oco ocr ocs oct oda odc odd ode odo odr ods odt oea oec oed oee oeo oer oes oet oka okc okd oke okk oko okr oks oo- ooa ooc ood ook ooo oor oos oot or- ora orc ord ore ork oro orr ors ort os- osa osc osd ose osk oso osr oss ost ot- ota otc otd ote otk oto otr ots ott ra- raa rac rad rae rak rao rar ras rat rca rcc rcd rce rco rcr rcs rct rda rdc rdd rde rdo rdr rds rdt re- rea rec red ree rek reo rer res ret rkc rke rkk rko rks rkt roa roc rod roe rok roo ror ros rot rra rrc rrd rrk rrr rrs rrt rsa rsc rsd rse rsk rso rsr rss rst rta rtc rtd rte rtk rto rtr rts rtt saa sac sad sae sak sao sar sas sat sca scc scd sce sck sco scr scs sct sda sdc sdd sde sdk sdo sdr sds sdt se- sea sec sed see sek seo ser ses set sk- ska skc skd ske skk sko skr sks skt soa soc sod soe sok soo sor sos sot sr- sra src srd sre srk sro srr srs srt ss- ssa ssc ssd sse ssk sso ssr sss sst sta stc std ste stk sto str sts stt taa tac tad tae tak tao tar tas tat tca tcc tcd tce tck tco tcr tcs tct tda tdc tdd tde tdk tdo tdr tds tdt te- tea tec ted tee tek teo ter tes tet tka tkc tke tkk tko tkr tks tkt to- toa toc tod toe tok too tor tos tot tra trc trd tre trk tro trr trs trt tsa tsc tsd tse tsk tso tsr tss tst tta ttc ttd tte ttk tto ttr tts ttt