a-a a-c a-t aaa aac aaf aan aar aas aat ac- aca acc acf acn acr acs act af- afa afc aff afn afr afs aft an- ana anc anf ann anr ans ant ar- ara arc arf arn arr ars art as- asa asc asf asn asr ass ast at- ata atc atf atn atr ats att c-- caa cac caf can car cas cat cca ccc ccf ccn ccr ccs cct cfa cfc cff cfn cfr cfs cft cn- cna cnc cnf cnn cnr cns cnt cra crc crf crn crr crs crt csa csc csf csn csr css cst cta ctc ctf ctn ctr cts ctt faa fac faf fan far fas fat fca fcc fcf fcn fcr fcs fct ffa ffc fff ffn ffr ffs fft fna fnc fnf fnn fnr fns fnt fra frc frf frn frr frs frt fsa fsc fsf fsn fsr fss fst fta ftc ftf ftn ftr fts ftt naa nac naf nan nar nas nat nca ncc ncf ncn ncr ncs nct nfa nfc nff nfn nfr nfs nft nna nnc nnf nnn nns nnt nra nrc nrf nrn nrr nrs nrt nsa nsc nsf nsn nsr nss nst nta ntc ntf ntn ntr nts ntt ra- raa rac raf ran rar ras rat rca rcc rcf rcn rcr rcs rct rfa rfc rff rfn rfr rfs rft rna rnc rnn rnr rns rnt rra rrc rrf rrn rrr rrs rrt rsa rsc rsf rsn rsr rss rst rta rtc rtf rtn rtr rts rtt saa sac saf san sar sas sat sca scc scf scn scr scs sct sfa sfc sff sfn sfr sfs sft sna snc snf snn snr sns snt sr- sra src srf srn srr srs srt ss- ssa ssc ssf ssn ssr sss sst sta stc stf stn str sts stt taa tac taf tan tar tas tat tca tcc tcf tcn tcr tcs tct tfa tfc tff tfn tfr tfs tft tna tnc tnf tnn tnr tns tnt tra trc trf trn trr trs trt tsa tsc tsf tsn tsr tss tst tta ttc ttf ttn ttr tts ttt