a-a a-c a-t aaa aac aan aao aar aat ac- aca acc acn aco acr act an- ana anc ann ano anr ant aoa aoc aon aoo aor aot ar- ara arc arn aro arr art at- ata atc atn ato atr att c-- caa cac can cao car cat cca ccc ccn cco ccr cct cn- cna cnc cnn cno cnr cnt co- coa coc con coo cor cot cra crc crn cro crr crt cta ctc ctn cto ctr ctt naa nac nan nao nar nat nca ncc ncn nco ncr nct nna nnc nnn nno nnt no- noa noc non noo nor not nra nrc nrn nro nrr nrt nta ntc ntn nto ntr ntt oaa oac oan oao oar oat oc- oca occ ocn oco ocr oct on- ona onc onn ono onr ont oo- ooa ooc oon ooo oor oot or- ora orc orn oro orr ort ot- ota otc otn oto otr ott ra- raa rac ran rao rar rat rca rcc rcn rco rcr rct rna rnc rnn rno rnr rnt roa roc ron roo ror rot rra rrc rrn rrr rrt rta rtc rtn rto rtr rtt taa tac tan tao tar tat tca tcc tcn tco tcr tct tna tnc tnn tno tnr tnt to- toa toc ton too tor tot tra trc trn tro trr trt tta ttc ttn tto ttr ttt