a-a a-c a-t aaa aac aao aar aas aat aay ac- aca acc aco acr acs act acy aoa aoc aoo aor aos aot ar- ara arc aro arr ars art ary as- asa asc aso asr ass ast asy at- ata atc ato atr ats att ay- aya ayc ayo ayr ays ayt c-- caa cac cao car cas cat cay cca ccc cco ccr ccs cct co- coa coc coo cor cos cot coy cra crc cro crr crs crt cry csa csc cso csr css cst csy cta ctc cto ctr cts ctt cty cya cyc cyo cyr cys cyt oaa oac oao oar oas oat oc- oca occ oco ocr ocs oct oo- ooa ooc ooo oor oos oot or- ora orc oro orr ors ort ory os- osa osc oso osr oss ost ot- ota otc oto otr ots ott oya oyo oys ra- raa rac rao rar ras rat ray rca rcc rco rcr rcs rct roa roc roo ror ros rot roy rra rrc rrr rrs rrt rsa rsc rso rsr rss rst rta rtc rto rtr rts rtt rty ry- rya ryc ryo ryr rys ryy saa sac sao sar sas sat say sca scc sco scr scs sct soa soc soo sor sos sot soy sr- sra src sro srr srs srt sry ss- ssa ssc sso ssr sss sst sta stc sto str sts stt sty sy- sya syc syr sys syt taa tac tao tar tas tat tay tca tcc tco tcr tcs tct to- toa toc too tor tos tot toy tra trc tro trr trs trt try tsa tsc tso tsr tss tst tsy tta ttc tto ttr tts ttt tty tya tyc tyo tyr tys tyt yaa yac yao yar yas yat yay yca ycc yco ycs ycy yoc yoo yor yos yot yoy yra yrc yro yrs yrt ysa ysc yso ysr yss yst ysy yta ytc yto ytr yts ytt yyc yys yyt yyy