a-a a-c a-t aaa aac aad aaf aan aar aas aat ac- aca acc acd acf acn acr acs act ad- ada adc add adf adn adr ads adt af- afa afc afd aff afn afr afs aft an- ana anc and anf ann anr ans ant ar- ara arc ard arf arn arr ars art as- asa asc asd asf asn asr ass ast at- ata atc atd atf atn atr ats att c-- caa cac cad caf can car cas cat cca ccc ccd ccf ccn ccr ccs cct cda cdc cdd cdf cdn cdr cds cdt cfa cfc cfd cff cfn cfr cfs cft cn- cna cnc cnd cnf cnn cnr cns cnt cra crc crd crf crn crr crs crt csa csc csd csf csn csr css cst cta ctc ctd ctf ctn ctr cts ctt daa dac dad daf dan dar das dat dca dcc dcd dcf dcn dcr dcs dct dda ddc ddd ddf ddn ddr dds ddt dfa dfc dfd dff dfn dfr dfs dft dna dnc dnd dnf dnn dnr dns dnt dra drc drd drn drr drs drt dsa dsc dsd dsf dsn dsr dss dst dta dtc dtd dtf dtn dtr dts dtt faa fac fad faf fan far fas fat fca fcc fcd fcf fcn fcr fcs fct fda fdc fdd fdf fdn fdr fds fdt ffa ffc ffd fff ffn ffr ffs fft fna fnc fnd fnf fnn fnr fns fnt fra frc frd frf frn frr frs frt fsa fsc fsd fsf fsn fsr fss fst fta ftc ftd ftf ftn ftr fts ftt naa nac nad naf nan nar nas nat nca ncc ncd ncf ncn ncr ncs nct nda ndc ndd ndf ndn ndr nds ndt nfa nfc nfd nff nfn nfr nfs nft nna nnc nnf nnn nns nnt nra nrc nrd nrf nrn nrr nrs nrt nsa nsc nsd nsf nsn nsr nss nst nta ntc ntd ntf ntn ntr nts ntt ra- raa rac rad raf ran rar ras rat rca rcc rcd rcf rcn rcr rcs rct rda rdc rdd rdf rdn rdr rds rdt rfa rfc rfd rff rfn rfr rfs rft rna rnc rnd rnn rnr rns rnt rra rrc rrd rrf rrn rrr rrs rrt rsa rsc rsd rsf rsn rsr rss rst rta rtc rtd rtf rtn rtr rts rtt saa sac sad saf san sar sas sat sca scc scd scf scn scr scs sct sda sdc sdd sdf sdn sdr sds sdt sfa sfc sfd sff sfn sfr sfs sft sna snc snd snf snn snr sns snt sr- sra src srd srf srn srr srs srt ss- ssa ssc ssd ssf ssn ssr sss sst sta stc std stf stn str sts stt taa tac tad taf tan tar tas tat tca tcc tcd tcf tcn tcr tcs tct tda tdc tdd tdf tdn tdr tds tdt tfa tfc tfd tff tfn tfr tfs tft tna tnc tnd tnf tnn tnr tns tnt tra trc trd trf trn trr trs trt tsa tsc tsd tsf tsn tsr tss tst tta ttc ttd ttf ttn ttr tts ttt