a-a a-c a-t aaa aac aaf aap aar aas aat ac- aca acc acf acp acr acs act af- afa afc aff afp afr afs aft ap- apa apc apf app apr aps apt ar- ara arc arf arp arr ars art as- asa asc asf asp asr ass ast at- ata atc atf atp atr ats att c-- caa cac caf cap car cas cat cca ccc ccf ccp ccr ccs cct cfa cfc cff cfp cfr cfs cft cpa cpc cpf cpp cpr cps cpt cra crc crf crp crr crs crt csa csc csf csp csr css cst cta ctc ctf ctp ctr cts ctt faa fac faf fap far fas fat fca fcc fcf fcp fcr fcs fct ffa ffc fff ffp ffr ffs fft fpa fpc fpp fpr fps fpt fra frc frf frp frr frs frt fsa fsc fsf fsp fsr fss fst fta ftc ftf ftp ftr fts ftt p-p paa pac paf pap par pas pat pca pcc pcf pcp pcr pcs pct pfa pfc pff pfp pfr pfs pft ppa ppc ppf ppp ppr pps ppt pra prc prf prp prr prs prt ps- psa psc psf psp psr pss pst pt- pta ptc ptf ptp ptr pts ptt ra- raa rac raf rap rar ras rat rca rcc rcf rcp rcr rcs rct rfa rfc rff rfp rfr rfs rft rpa rpc rpf rpp rpr rps rpt rra rrc rrf rrp rrr rrs rrt rsa rsc rsf rsp rsr rss rst rta rtc rtf rtp rtr rts rtt saa sac saf sap sar sas sat sca scc scf scp scr scs sct sfa sfc sff sfp sfr sfs sft spa spc spf spp spr sps spt sr- sra src srf srp srr srs srt ss- ssa ssc ssf ssp ssr sss sst sta stc stf stp str sts stt taa tac taf tap tar tas tat tca tcc tcf tcp tcr tcs tct tfa tfc tff tfp tfr tfs tft tpa tpc tpf tpp tpr tps tpt tra trc trf trp trr trs trt tsa tsc tsf tsp tsr tss tst tta ttc ttf ttp ttr tts ttt