a-a a-b a-i a-t aaa aab aaf aai aao aap aar aas aat ab- aba abb abf abi abo abp abr abs abt af- afa afb aff afi afo afp afr afs aft ai- aia aib aif aii aio aip air ais ait aoa aob aof aoi aoo aop aor aos aot ap- apa apb apf api apo app apr aps apt ar- ara arb arf ari aro arp arr ars art as- asa asb asf asi aso asp asr ass ast at- ata atb atf ati ato atp atr ats att b-p baa bab baf bai bao bap bar bas bat bba bbb bbf bbi bbo bbp bbr bbs bbt bfa bfb bff bfi bfo bfp bfr bfs bft bi- bia bib bif bii bio bip bir bis bit boa bob bof boi boo bop bor bos bot bpa bpb bpf bpi bpo bpp bpr bps bpt bra brb brf bri bro brp brr brs brt bsa bsb bsf bsi bso bsp bsr bss bst bta btb btf bti bto btp btr bts btt faa fab faf fai fao fap far fas fat fba fbb fbf fbi fbo fbp fbr fbs fbt ffa fff ffi ffo ffp ffr ffs fft fia fib fif fii fip fir fis fit foa fob fof foi foo fop for fos fot fpa fpb fpi fpo fpp fpr fps fpt fra frb frf fri fro frp frr frs frt fsa fsb fsf fsi fso fsp fsr fss fst fta ftb ftf fti fto ftp ftr fts ftt i-f ia- iaa iab iaf iai iao iap iar ias iat iba ibb ibf ibi ibo ibp ibr ibs ibt ifa ifb iff ifi ifo ifp ifr ifs ift iia iib iif iii iio iip iir iis iit io- ioa iob iof ioi ioo iop ior ios iot ipa ipb ipf ipi ipo ipp ipr ips ipt ir- ira irb irf iri iro irp irr irs irt is- isa isb isf isi iso isp isr iss ist ita itb itf iti ito itp its itt o-i oaa oab oaf oai oao oap oar oas oat ob- oba obb obf obi obo obp obr obs obt of- ofa ofb off ofi ofo ofp ofr ofs oft oia oib oif oii oio oip oir ois oit oo- ooa oob oof ooi ooo oop oor oos oot op- opa opb opf opi opo opp opr ops opt or- ora orb orf ori oro orp orr ors ort os- osa osb osf osi oso osp osr oss ost ot- ota otb otf oti oto otp otr ots ott p-p paa pab paf pai pao pap par pas pat pba pbb pbf pbi pbo pbp pbr pbs pbt pfa pfb pff pfi pfo pfp pfr pfs pft pia pib pif pii pio pip pir pis pit poa pob pof poi poo pop por pos pot ppa ppb ppf ppi ppo ppp ppr pps ppt pra prb prf pri pro prp prr prs prt ps- psa psb psf psi pso psp psr pss pst pt- pta ptb ptf pti pto ptp ptr pts ptt ra- raa rab raf rai rao rap rar ras rat rba rbb rbf rbi rbo rbp rbr rbs rbt rfa rfb rff rfi rfo rfp rfr rfs rft ria rib rif rii rio rip rir ris rit roa rob rof roi roo rop ror ros rot rpa rpb rpf rpi rpo rpp rpr rps rpt rra rrb rrf rri rrp rrr rrs rrt rsa rsb rsf rsi rso rsp rsr rss rst rta rtb rtf rti rto rtp rtr rts rtt saa sab saf sai sao sap sar sas sat sba sbb sbf sbi sbo sbp sbr sbs sbt sfa sfb sff sfi sfo sfp sfr sfs sft sia sib sif sii sio sip sir sis sit soa sob sof soi soo sop sor sos sot spa spb spf spi spo spp spr sps spt sr- sra srb srf sri sro srp srr srs srt ss- ssa ssb ssf ssi sso ssp ssr sss sst sta stb stf sti sto stp str sts stt taa tab taf tai tao tap tar tas tat tba tbb tbf tbi tbo tbp tbr tbs tbt tfa tfb tff tfi tfo tfp tfr tfs tft tia tib tif tii tio tip tir tis tit to- toa tob tof toi too top tor tos tot tpa tpb tpf tpi tpo tpp tpr tps tpt tra trb trf tri tro trp trr trs trt tsa tsb tsf tsi tso tsp tsr tss tst tta ttb ttf tti tto ttp ttr tts ttt