a-a a-c a-t aaa aac aaf aao aap aar aat ac- aca acc acf aco acp acr act af- afa afc aff afo afp afr aft aoa aoc aof aoo aop aor aot ap- apa apc apf apo app apr apt ar- ara arc arf aro arp arr art at- ata atc atf ato atp atr att c-- caa cac caf cao cap car cat cca ccc ccf cco ccp ccr cct cfa cfc cff cfo cfp cfr cft co- coa coc cof coo cop cor cot cpa cpc cpf cpo cpp cpr cpt cra crc crf cro crp crr crt cta ctc ctf cto ctp ctr ctt faa fac faf fao fap far fat fca fcc fcf fco fcp fcr fct ffa ffc fff ffo ffp ffr fft foa foc fof foo fop for fot fpa fpc fpo fpp fpr fpt fra frc frf fro frp frr frt fta ftc ftf fto ftp ftr ftt oaa oac oaf oao oap oar oat oc- oca occ ocf oco ocp ocr oct of- ofa ofc off ofo ofp ofr oft oo- ooa ooc oof ooo oop oor oot op- opa opc opf opo opp opr opt or- ora orc orf oro orp orr ort ot- ota otc otf oto otp otr ott p-p paa pac paf pao pap par pat pca pcc pcf pco pcp pcr pct pfa pfc pff pfo pfp pfr pft poa poc pof poo pop por pot ppa ppc ppf ppo ppp ppr ppt pra prc prf pro prp prr prt pt- pta ptc ptf pto ptp ptr ptt ra- raa rac raf rao rap rar rat rca rcc rcf rco rcp rcr rct rfa rfc rff rfo rfp rfr rft roa roc rof roo rop ror rot rpa rpc rpf rpo rpp rpr rpt rra rrc rrf rrp rrr rrt rta rtc rtf rto rtp rtr rtt taa tac taf tao tap tar tat tca tcc tcf tco tcp tcr tct tfa tfc tff tfo tfp tfr tft to- toa toc tof too top tor tot tpa tpc tpf tpo tpp tpr tpt tra trc trf tro trp trr trt tta ttc ttf tto ttp ttr ttt