a-a a-c a-t aaa aac aad aan aar aas aat ac- aca acc acd acn acr acs act ad- ada adc add adn adr ads adt an- ana anc and ann anr ans ant ar- ara arc ard arn arr ars art as- asa asc asd asn asr ass ast at- ata atc atd atn atr ats att c-- caa cac cad can car cas cat cca ccc ccd ccn ccr ccs cct cda cdc cdd cdn cdr cds cdt cn- cna cnc cnd cnn cnr cns cnt cra crc crd crn crr crs crt csa csc csd csn csr css cst cta ctc ctd ctn ctr cts ctt daa dac dad dan dar das dat dca dcc dcd dcn dcr dcs dct dda ddc ddd ddn ddr dds ddt dna dnc dnd dnn dnr dns dnt dra drc drd drn drr drs drt dsa dsc dsd dsn dsr dss dst dta dtc dtd dtn dtr dts dtt naa nac nad nan nar nas nat nca ncc ncd ncn ncr ncs nct nda ndc ndd ndn ndr nds ndt nna nnc nnn nns nnt nra nrc nrd nrn nrr nrs nrt nsa nsc nsd nsn nsr nss nst nta ntc ntd ntn ntr nts ntt ra- raa rac rad ran rar ras rat rca rcc rcd rcn rcr rcs rct rda rdc rdd rdn rdr rds rdt rna rnc rnd rnn rnr rns rnt rra rrc rrd rrn rrr rrs rrt rsa rsc rsd rsn rsr rss rst rta rtc rtd rtn rtr rts rtt saa sac sad san sar sas sat sca scc scd scn scr scs sct sda sdc sdd sdn sdr sds sdt sna snc snd snn snr sns snt sr- sra src srd srn srr srs srt ss- ssa ssc ssd ssn ssr sss sst sta stc std stn str sts stt taa tac tad tan tar tas tat tca tcc tcd tcn tcr tcs tct tda tdc tdd tdn tdr tds tdt tna tnc tnd tnn tnr tns tnt tra trc trd trn trr trs trt tsa tsc tsd tsn tsr tss tst tta ttc ttd ttn ttr tts ttt