a-a a-c a-t aaa aac aad aao aar aas aat ac- aca acc acd aco acr acs act ad- ada adc add ado adr ads adt aoa aoc aod aoo aor aos aot ar- ara arc ard aro arr ars art as- asa asc asd aso asr ass ast at- ata atc atd ato atr ats att c-- caa cac cad cao car cas cat cca ccc ccd cco ccr ccs cct cda cdc cdd cdo cdr cds cdt co- coa coc cod coo cor cos cot cra crc crd cro crr crs crt csa csc csd cso csr css cst cta ctc ctd cto ctr cts ctt daa dac dad dao dar das dat dca dcc dcd dco dcr dcs dct dda ddc ddd ddo ddr dds ddt doa doc dod doo dor dos dot dra drc drd dro drr drs drt dsa dsc dsd dso dsr dss dst dta dtc dtd dto dtr dts dtt oaa oac oad oao oar oas oat oc- oca occ ocd oco ocr ocs oct oda odc odd odo odr ods odt oo- ooa ooc ood ooo oor oos oot or- ora orc ord oro orr ors ort os- osa osc osd oso osr oss ost ot- ota otc otd oto otr ots ott ra- raa rac rad rao rar ras rat rca rcc rcd rco rcr rcs rct rda rdc rdd rdo rdr rds rdt roa roc rod roo ror ros rot rra rrc rrd rrr rrs rrt rsa rsc rsd rso rsr rss rst rta rtc rtd rto rtr rts rtt saa sac sad sao sar sas sat sca scc scd sco scr scs sct sda sdc sdd sdo sdr sds sdt soa soc sod soo sor sos sot sr- sra src srd sro srr srs srt ss- ssa ssc ssd sso ssr sss sst sta stc std sto str sts stt taa tac tad tao tar tas tat tca tcc tcd tco tcr tcs tct tda tdc tdd tdo tdr tds tdt to- toa toc tod too tor tos tot tra trc trd tro trr trs trt tsa tsc tsd tso tsr tss tst tta ttc ttd tto ttr tts ttt