a-a a-c a-t aaa aac aar aas aat aay ac- aca acc acr acs act acy ar- ara arc arr ars art ary as- asa asc asr ass ast asy at- ata atc atr ats att ay- aya ayc ayr ays ayt c-- caa cac car cas cat cay cca ccc ccr ccs cct cra crc crr crs crt cry csa csc csr css cst csy cta ctc ctr cts ctt cty cya cyc cyr cys cyt ra- raa rac rar ras rat ray rca rcc rcr rcs rct rra rrc rrr rrs rrt rsa rsc rsr rss rst rta rtc rtr rts rtt rty ry- rya ryc ryr rys ryy saa sac sar sas sat say sca scc scr scs sct sr- sra src srr srs srt sry ss- ssa ssc ssr sss sst sta stc str sts stt sty sy- sya syc syr sys syt taa tac tar tas tat tay tca tcc tcr tcs tct tra trc trr trs trt try tsa tsc tsr tss tst tsy tta ttc ttr tts ttt tty tya tyc tyr tys tyt yaa yac yar yas yat yay yca ycc ycs ycy yra yrc yrs yrt ysa ysc ysr yss yst ysy yta ytc ytr yts ytt yyc yys yyt yyy