a-a a-c a-t aaa aac aao aar aat aay ac- aca acc aco acr act acy aoa aoc aoo aor aot ar- ara arc aro arr art ary at- ata atc ato atr att ay- aya ayc ayo ayr ayt c-- caa cac cao car cat cay cca ccc cco ccr cct co- coa coc coo cor cot coy cra crc cro crr crt cry cta ctc cto ctr ctt cty cya cyc cyo cyr cyt oaa oac oao oar oat oc- oca occ oco ocr oct oo- ooa ooc ooo oor oot or- ora orc oro orr ort ory ot- ota otc oto otr ott oya oyo ra- raa rac rao rar rat ray rca rcc rco rcr rct roa roc roo ror rot roy rra rrc rrr rrt rta rtc rto rtr rtt rty ry- rya ryc ryo ryr ryy taa tac tao tar tat tay tca tcc tco tcr tct to- toa toc too tor tot toy tra trc tro trr trt try tta ttc tto ttr ttt tty tya tyc tyo tyr tyt yaa yac yao yar yat yay yca ycc yco ycy yoc yoo yor yot yoy yra yrc yro yrt yta ytc yto ytr ytt yyc yyt yyy