-er a-a a-c a-t aaa aac aad aae aaf aao aar aas aat ac- aca acc acd ace acf aco acr acs act ad- ada adc add ade adf ado adr ads adt aea aec aed aee aef aeo aer aes aet af- afa afc afd afe aff afo afr afs aft aoa aoc aod aoe aof aoo aor aos aot ar- ara arc ard are arf aro arr ars art as- asa asc asd ase asf aso asr ass ast at- ata atc atd ate atf ato atr ats att c-- caa cac cad cae caf cao car cas cat cca ccc ccd cce ccf cco ccr ccs cct cda cdc cdd cde cdf cdo cdr cds cdt ce- cea cec ced cee cef ceo cer ces cet cfa cfc cfd cfe cff cfo cfr cfs cft co- coa coc cod coe cof coo cor cos cot cra crc crd cre crf cro crr crs crt csa csc csd cse csf cso csr css cst cta ctc ctd cte ctf cto ctr cts ctt daa dac dad dae daf dao dar das dat dca dcc dcd dce dcf dco dcr dcs dct dda ddc ddd dde ddf ddo ddr dds ddt de- dea dec ded dee def deo der des det dfa dfc dfd dfe dff dfo dfr dfs dft doa doc dod doe dof doo dor dos dot dra drc drd dre dro drr drs drt dsa dsc dsd dse dsf dso dsr dss dst dta dtc dtd dte dtf dto dtr dts dtt eaa eac ead eae eaf eao ear eas eat ec- eca ecc ecd ece ecf eco ecr ecs ect ed- eda edc edd ede edf edo edr eds edt eea eec eed eee eef eeo eer ees eet ef- efa efc efd efe eff efo efr efs eft eo- eoa eoc eod eoe eof eoo eor eos eot era erc erd ere erf ero err ers ert es- esa esc esd ese esf eso esr ess est eta etc etd ete etf eto etr ets ett faa fac fad fae faf fao far fas fat fca fcc fcd fce fcf fco fcr fcs fct fda fdc fdd fde fdf fdo fdr fds fdt fea fec fed fee fef feo fer fes fet ffa ffc ffd ffe fff ffo ffr ffs fft foa foc foe fof foo for fos fot fra frc frd fre frf fro frr frs frt fsa fsc fsd fse fsf fso fsr fss fst fta ftc ftd fte ftf fto ftr fts ftt oaa oac oad oae oaf oao oar oas oat oc- oca occ ocd ocf oco ocr ocs oct oda odc odd ode odf odo odr ods odt oea oec oed oee oef oeo oer oes oet of- ofa ofc ofd ofe off ofo ofr ofs oft oo- ooa ooc ood oof ooo oor oos oot or- ora orc ord ore orf oro orr ors ort os- osa osc osd ose osf oso osr oss ost ot- ota otc otd ote otf oto otr ots ott ra- raa rac rad rae raf rao rar ras rat rca rcc rcd rce rcf rco rcr rcs rct rda rdc rdd rde rdf rdo rdr rds rdt re- rea rec red ree ref reo rer res ret rfa rfc rfd rfe rff rfo rfr rfs rft roa roc rod roe rof roo ror ros rot rra rrc rrd rrf rrr rrs rrt rsa rsc rsd rse rsf rso rsr rss rst rta rtc rtd rte rtf rto rtr rts rtt saa sac sad sae saf sao sar sas sat sca scc scd sce scf sco scr scs sct sda sdc sdd sde sdf sdo sdr sds sdt se- sea sec sed see sef seo ser ses set sfa sfc sfd sfe sff sfo sfr sfs sft soa soc sod soe sof soo sor sos sot sr- sra src srd sre srf sro srr srs srt ss- ssa ssc ssd sse ssf sso ssr sss sst sta stc std ste stf sto str sts stt taa tac tad tae taf tao tar tas tat tca tcc tcd tce tcf tco tcr tcs tct tda tdc tdd tde tdf tdo tdr tds tdt te- tea tec ted tee tef teo ter tes tet tfa tfc tfd tfe tff tfo tfr tfs tft to- toa toc tod toe tof too tor tos tot tra trc trd tre trf tro trr trs trt tsa tsc tsd tse tsf tso tsr tss tst tta ttc ttd tte ttf tto ttr tts ttt