a-a a-c a-t aaa aac aaf aan aao aar aat ac- aca acc acf acn aco acr act af- afa afc aff afn afo afr aft an- ana anc anf ann ano anr ant aoa aoc aof aon aoo aor aot ar- ara arc arf arn aro arr art at- ata atc atf atn ato atr att c-- caa cac caf can cao car cat cca ccc ccf ccn cco ccr cct cfa cfc cff cfn cfo cfr cft cn- cna cnc cnf cnn cno cnr cnt co- coa coc cof con coo cor cot cra crc crf crn cro crr crt cta ctc ctf ctn cto ctr ctt faa fac faf fan fao far fat fca fcc fcf fcn fco fcr fct ffa ffc fff ffn ffo ffr fft fna fnc fnf fnn fnr fnt foa foc fof fon foo for fot fra frc frf frn fro frr frt fta ftc ftf ftn fto ftr ftt naa nac naf nan nao nar nat nca ncc ncf ncn nco ncr nct nfa nfc nff nfn nfo nfr nft nna nnc nnf nnn nno nnt no- noa noc nof non noo nor not nra nrc nrf nrn nro nrr nrt nta ntc ntf ntn nto ntr ntt oaa oac oaf oan oao oar oat oc- oca occ ocf ocn oco ocr oct of- ofa ofc off ofn ofo ofr oft on- ona onc onf onn ono onr ont oo- ooa ooc oof oon ooo oor oot or- ora orc orf orn oro orr ort ot- ota otc otf otn oto otr ott ra- raa rac raf ran rao rar rat rca rcc rcf rcn rco rcr rct rfa rfc rff rfn rfo rfr rft rna rnc rnn rno rnr rnt roa roc rof ron roo ror rot rra rrc rrf rrn rrr rrt rta rtc rtf rtn rto rtr rtt taa tac taf tan tao tar tat tca tcc tcf tcn tco tcr tct tfa tfc tff tfn tfo tfr tft tna tnc tnf tnn tno tnr tnt to- toa toc tof ton too tor tot tra trc trf trn tro trr trt tta ttc ttf ttn tto ttr ttt