a-a a-t aaa aaf aao aap aar aas aat af- afa aff afo afp afr afs aft aoa aof aoo aop aor aos aot ap- apa apf apo app apr aps apt ar- ara arf aro arp arr ars art as- asa asf aso asp asr ass ast at- ata atf ato atp atr ats att faa faf fao fap far fas fat ffa fff ffo ffp ffr ffs fft foa fof foo fop for fos fot fpa fpo fpp fpr fps fpt fra frf fro frp frr frs frt fsa fsf fso fsp fsr fss fst fta ftf fto ftp ftr fts ftt oaa oaf oao oap oar oas oat of- ofa off ofo ofp ofr ofs oft oo- ooa oof ooo oop oor oos oot op- opa opf opo opp opr ops opt or- ora orf oro orp orr ors ort os- osa osf oso osp osr oss ost ot- ota otf oto otp otr ots ott p-p paa paf pao pap par pas pat pfa pff pfo pfp pfr pfs pft poa pof poo pop por pos pot ppa ppf ppo ppp ppr pps ppt pra prf pro prp prr prs prt ps- psa psf pso psp psr pss pst pt- pta ptf pto ptp ptr pts ptt ra- raa raf rao rap rar ras rat rfa rff rfo rfp rfr rfs rft roa rof roo rop ror ros rot rpa rpf rpo rpp rpr rps rpt rra rrf rrp rrr rrs rrt rsa rsf rso rsp rsr rss rst rta rtf rto rtp rtr rts rtt saa saf sao sap sar sas sat sfa sff sfo sfp sfr sfs sft soa sof soo sop sor sos sot spa spf spo spp spr sps spt sr- sra srf sro srp srr srs srt ss- ssa ssf sso ssp ssr sss sst sta stf sto stp str sts stt taa taf tao tap tar tas tat tfa tff tfo tfp tfr tfs tft to- toa tof too top tor tos tot tpa tpf tpo tpp tpr tps tpt tra trf tro trp trr trs trt tsa tsf tso tsp tsr tss tst tta ttf tto ttp ttr tts ttt