a-a a-c a-t aaa aac aad aaf aao aar aat ac- aca acc acd acf aco acr act ad- ada adc add adf ado adr adt af- afa afc afd aff afo afr aft aoa aoc aod aof aoo aor aot ar- ara arc ard arf aro arr art at- ata atc atd atf ato atr att c-- caa cac cad caf cao car cat cca ccc ccd ccf cco ccr cct cda cdc cdd cdf cdo cdr cdt cfa cfc cfd cff cfo cfr cft co- coa coc cod cof coo cor cot cra crc crd crf cro crr crt cta ctc ctd ctf cto ctr ctt daa dac dad daf dao dar dat dca dcc dcd dcf dco dcr dct dda ddc ddd ddf ddo ddr ddt dfa dfc dfd dff dfo dfr dft doa doc dod dof doo dor dot dra drc drd dro drr drt dta dtc dtd dtf dto dtr dtt faa fac fad faf fao far fat fca fcc fcd fcf fco fcr fct fda fdc fdd fdf fdo fdr fdt ffa ffc ffd fff ffo ffr fft foa foc fof foo for fot fra frc frd frf fro frr frt fta ftc ftd ftf fto ftr ftt oaa oac oad oaf oao oar oat oc- oca occ ocd ocf oco ocr oct oda odc odd odf odo odr odt of- ofa ofc ofd off ofo ofr oft oo- ooa ooc ood oof ooo oor oot or- ora orc ord orf oro orr ort ot- ota otc otd otf oto otr ott ra- raa rac rad raf rao rar rat rca rcc rcd rcf rco rcr rct rda rdc rdd rdf rdo rdr rdt rfa rfc rfd rff rfo rfr rft roa roc rod rof roo ror rot rra rrc rrd rrf rrr rrt rta rtc rtd rtf rto rtr rtt taa tac tad taf tao tar tat tca tcc tcd tcf tco tcr tct tda tdc tdd tdf tdo tdr tdt tfa tfc tfd tff tfo tfr tft to- toa toc tod tof too tor tot tra trc trd trf tro trr trt tta ttc ttd ttf tto ttr ttt