a-a a-c a-t aaa aac aad aaf aao aar aas aat ac- aca acc acd acf aco acr acs act ad- ada adc add adf ado adr ads adt af- afa afc afd aff afo afr afs aft aoa aoc aod aof aoo aor aos aot ar- ara arc ard arf aro arr ars art as- asa asc asd asf aso asr ass ast at- ata atc atd atf ato atr ats att c-- caa cac cad caf cao car cas cat cca ccc ccd ccf cco ccr ccs cct cda cdc cdd cdf cdo cdr cds cdt cfa cfc cfd cff cfo cfr cfs cft co- coa coc cod cof coo cor cos cot cra crc crd crf cro crr crs crt csa csc csd csf cso csr css cst cta ctc ctd ctf cto ctr cts ctt daa dac dad daf dao dar das dat dca dcc dcd dcf dco dcr dcs dct dda ddc ddd ddf ddo ddr dds ddt dfa dfc dfd dff dfo dfr dfs dft doa doc dod dof doo dor dos dot dra drc drd dro drr drs drt dsa dsc dsd dsf dso dsr dss dst dta dtc dtd dtf dto dtr dts dtt faa fac fad faf fao far fas fat fca fcc fcd fcf fco fcr fcs fct fda fdc fdd fdf fdo fdr fds fdt ffa ffc ffd fff ffo ffr ffs fft foa foc fof foo for fos fot fra frc frd frf fro frr frs frt fsa fsc fsd fsf fso fsr fss fst fta ftc ftd ftf fto ftr fts ftt oaa oac oad oaf oao oar oas oat oc- oca occ ocd ocf oco ocr ocs oct oda odc odd odf odo odr ods odt of- ofa ofc ofd off ofo ofr ofs oft oo- ooa ooc ood oof ooo oor oos oot or- ora orc ord orf oro orr ors ort os- osa osc osd osf oso osr oss ost ot- ota otc otd otf oto otr ots ott ra- raa rac rad raf rao rar ras rat rca rcc rcd rcf rco rcr rcs rct rda rdc rdd rdf rdo rdr rds rdt rfa rfc rfd rff rfo rfr rfs rft roa roc rod rof roo ror ros rot rra rrc rrd rrf rrr rrs rrt rsa rsc rsd rsf rso rsr rss rst rta rtc rtd rtf rto rtr rts rtt saa sac sad saf sao sar sas sat sca scc scd scf sco scr scs sct sda sdc sdd sdf sdo sdr sds sdt sfa sfc sfd sff sfo sfr sfs sft soa soc sod sof soo sor sos sot sr- sra src srd srf sro srr srs srt ss- ssa ssc ssd ssf sso ssr sss sst sta stc std stf sto str sts stt taa tac tad taf tao tar tas tat tca tcc tcd tcf tco tcr tcs tct tda tdc tdd tdf tdo tdr tds tdt tfa tfc tfd tff tfo tfr tfs tft to- toa toc tod tof too tor tos tot tra trc trd trf tro trr trs trt tsa tsc tsd tsf tso tsr tss tst tta ttc ttd ttf tto ttr tts ttt