-er a-a a-c a-t aaa aac aad aae aak aar aas aat ac- aca acc acd ace ack acr acs act ad- ada adc add ade adk adr ads adt aea aec aed aee aek aer aes aet aka akc akd ake akk akr aks ar- ara arc ard are ark arr ars art as- asa asc asd ase ask asr ass ast at- ata atc atd ate atr ats att c-- caa cac cad cae cak car cas cat cca ccc ccd cce cck ccr ccs cct cda cdc cdd cde cdk cdr cds cdt ce- cea cec ced cee cek cer ces cet cka ckc ckd cks ckt cra crc crd cre crk crr crs crt csa csc csd cse csk csr css cst cta ctc ctd cte ctk ctr cts ctt daa dac dad dae dak dar das dat dca dcc dcd dce dck dcr dcs dct dda ddc ddd dde ddk ddr dds ddt de- dea dec ded dee dek der des det dka dkc dke dkk dkr dks dkt dra drc drd dre drk drr drs drt dsa dsc dsd dse dsk dsr dss dst dta dtc dtd dte dtk dtr dts dtt eaa eac ead eae eak ear eas eat ec- eca ecc ecd ece eck ecr ecs ect ed- eda edc edd ede edk edr eds edt eea eec eed eee eek eer ees eet eka ekc ekd eke ekr eks ekt era erc erd ere erk err ers ert es- esa esc esd ese esk esr ess est eta etc etd ete etk etr ets ett k-t ka- kaa kac kad kae kak kar kas kat kca kcc kcd kce kck kcr kcs kct kda kdc kde kdk kdr kds kdt ke- kea kec ked kee kek ker kes ket kkc kke kkk kkr kks kkt kra krc krd krk krr krs krt ksa ksc ksd kse ksk ksr kss kst kta ktc kte ktk ktr kts ktt ra- raa rac rad rae rak rar ras rat rca rcc rcd rce rcr rcs rct rda rdc rdd rde rdr rds rdt re- rea rec red ree rek rer res ret rkc rke rkk rks rkt rra rrc rrd rrk rrr rrs rrt rsa rsc rsd rse rsk rsr rss rst rta rtc rtd rte rtk rtr rts rtt saa sac sad sae sak sar sas sat sca scc scd sce sck scr scs sct sda sdc sdd sde sdk sdr sds sdt se- sea sec sed see sek ser ses set sk- ska skc skd ske skk skr sks skt sr- sra src srd sre srk srr srs srt ss- ssa ssc ssd sse ssk ssr sss sst sta stc std ste stk str sts stt taa tac tad tae tak tar tas tat tca tcc tcd tce tck tcr tcs tct tda tdc tdd tde tdk tdr tds tdt te- tea tec ted tee tek ter tes tet tka tkc tke tkk tkr tks tkt tra trc trd tre trk trr trs trt tsa tsc tsd tse tsk tsr tss tst tta ttc ttd tte ttk ttr tts ttt