a-a a-c a-t aaa aac aaf aao aap aar aas aat ac- aca acc acf aco acp acr acs act af- afa afc aff afo afp afr afs aft aoa aoc aof aoo aop aor aos aot ap- apa apc apf apo app apr aps apt ar- ara arc arf aro arp arr ars art as- asa asc asf aso asp asr ass ast at- ata atc atf ato atp atr ats att c-- caa cac caf cao cap car cas cat cca ccc ccf cco ccp ccr ccs cct cfa cfc cff cfo cfp cfr cfs cft co- coa coc cof coo cop cor cos cot cpa cpc cpf cpo cpp cpr cps cpt cra crc crf cro crp crr crs crt csa csc csf cso csp csr css cst cta ctc ctf cto ctp ctr cts ctt faa fac faf fao fap far fas fat fca fcc fcf fco fcp fcr fcs fct ffa ffc fff ffo ffp ffr ffs fft foa foc fof foo fop for fos fot fpa fpc fpo fpp fpr fps fpt fra frc frf fro frp frr frs frt fsa fsc fsf fso fsp fsr fss fst fta ftc ftf fto ftp ftr fts ftt oaa oac oaf oao oap oar oas oat oc- oca occ ocf oco ocp ocr ocs oct of- ofa ofc off ofo ofp ofr ofs oft oo- ooa ooc oof ooo oop oor oos oot op- opa opc opf opo opp opr ops opt or- ora orc orf oro orp orr ors ort os- osa osc osf oso osp osr oss ost ot- ota otc otf oto otp otr ots ott p-p paa pac paf pao pap par pas pat pca pcc pcf pco pcp pcr pcs pct pfa pfc pff pfo pfp pfr pfs pft poa poc pof poo pop por pos pot ppa ppc ppf ppo ppp ppr pps ppt pra prc prf pro prp prr prs prt ps- psa psc psf pso psp psr pss pst pt- pta ptc ptf pto ptp ptr pts ptt ra- raa rac raf rao rap rar ras rat rca rcc rcf rco rcp rcr rcs rct rfa rfc rff rfo rfp rfr rfs rft roa roc rof roo rop ror ros rot rpa rpc rpf rpo rpp rpr rps rpt rra rrc rrf rrp rrr rrs rrt rsa rsc rsf rso rsp rsr rss rst rta rtc rtf rto rtp rtr rts rtt saa sac saf sao sap sar sas sat sca scc scf sco scp scr scs sct sfa sfc sff sfo sfp sfr sfs sft soa soc sof soo sop sor sos sot spa spc spf spo spp spr sps spt sr- sra src srf sro srp srr srs srt ss- ssa ssc ssf sso ssp ssr sss sst sta stc stf sto stp str sts stt taa tac taf tao tap tar tas tat tca tcc tcf tco tcp tcr tcs tct tfa tfc tff tfo tfp tfr tfs tft to- toa toc tof too top tor tos tot tpa tpc tpf tpo tpp tpr tps tpt tra trc trf tro trp trr trs trt tsa tsc tsf tso tsp tsr tss tst tta ttc ttf tto ttp ttr tts ttt