a-a a-c a-t aaa aac aad aar aas aat ac- aca acc acd acr acs act ad- ada adc add adr ads adt ar- ara arc ard arr ars art as- asa asc asd asr ass ast at- ata atc atd atr ats att c-- caa cac cad car cas cat cca ccc ccd ccr ccs cct cda cdc cdd cdr cds cdt cra crc crd crr crs crt csa csc csd csr css cst cta ctc ctd ctr cts ctt daa dac dad dar das dat dca dcc dcd dcr dcs dct dda ddc ddd ddr dds ddt dra drc drd drr drs drt dsa dsc dsd dsr dss dst dta dtc dtd dtr dts dtt ra- raa rac rad rar ras rat rca rcc rcd rcr rcs rct rda rdc rdd rdr rds rdt rra rrc rrd rrr rrs rrt rsa rsc rsd rsr rss rst rta rtc rtd rtr rts rtt saa sac sad sar sas sat sca scc scd scr scs sct sda sdc sdd sdr sds sdt sr- sra src srd srr srs srt ss- ssa ssc ssd ssr sss sst sta stc std str sts stt taa tac tad tar tas tat tca tcc tcd tcr tcs tct tda tdc tdd tdr tds tdt tra trc trd trr trs trt tsa tsc tsd tsr tss tst tta ttc ttd ttr tts ttt