a-a a-c a-t aaa aac aan aao aar aas aat ac- aca acc acn aco acr acs act an- ana anc ann ano anr ans ant aoa aoc aon aoo aor aos aot ar- ara arc arn aro arr ars art as- asa asc asn aso asr ass ast at- ata atc atn ato atr ats att c-- caa cac can cao car cas cat cca ccc ccn cco ccr ccs cct cn- cna cnc cnn cno cnr cns cnt co- coa coc con coo cor cos cot cra crc crn cro crr crs crt csa csc csn cso csr css cst cta ctc ctn cto ctr cts ctt naa nac nan nao nar nas nat nca ncc ncn nco ncr ncs nct nna nnc nnn nno nns nnt no- noa noc non noo nor nos not nra nrc nrn nro nrr nrs nrt nsa nsc nsn nso nsr nss nst nta ntc ntn nto ntr nts ntt oaa oac oan oao oar oas oat oc- oca occ ocn oco ocr ocs oct on- ona onc onn ono onr ons ont oo- ooa ooc oon ooo oor oos oot or- ora orc orn oro orr ors ort os- osa osc osn oso osr oss ost ot- ota otc otn oto otr ots ott ra- raa rac ran rao rar ras rat rca rcc rcn rco rcr rcs rct rna rnc rnn rno rnr rns rnt roa roc ron roo ror ros rot rra rrc rrn rrr rrs rrt rsa rsc rsn rso rsr rss rst rta rtc rtn rto rtr rts rtt saa sac san sao sar sas sat sca scc scn sco scr scs sct sna snc snn sno snr sns snt soa soc son soo sor sos sot sr- sra src srn sro srr srs srt ss- ssa ssc ssn sso ssr sss sst sta stc stn sto str sts stt taa tac tan tao tar tas tat tca tcc tcn tco tcr tcs tct tna tnc tnn tno tnr tns tnt to- toa toc ton too tor tos tot tra trc trn tro trr trs trt tsa tsc tsn tso tsr tss tst tta ttc ttn tto ttr tts ttt