a-a a-b a-i a-t aaa aab aag aai aao aap aar aas aat ab- aba abb abg abi abo abp abr abs abt ag- aga agb agg agi ago agp agr ags agt ai- aia aib aig aii aio aip air ais ait aoa aob aog aoi aoo aop aor aos aot ap- apa apb apg api apo app apr aps apt ar- ara arb arg ari aro arp arr ars art as- asa asb asg asi aso asp asr ass ast at- ata atb atg ati ato atp atr ats att b-p baa bab bag bai bao bap bar bas bat bba bbb bbg bbi bbo bbp bbr bbs bbt bga bgb bgg bgi bgo bgp bgr bgs bgt bi- bia bib big bii bio bip bir bis bit boa bob bog boi boo bop bor bos bot bpa bpb bpg bpi bpo bpp bpr bps bpt bra brb brg bri bro brp brr brs brt bsa bsb bsg bsi bso bsp bsr bss bst bta btb btg bti bto btp btr bts btt g-p gaa gab gag gai gao gap gar gas gat gba gbg gbi gbo gbp gbr gbs gbt gga ggb ggg ggi ggo ggp ggr ggs ggt gia gib gig gii gio gip gir gis git goa gob gog goi goo gop gor gos got gpa gpb gpg gpi gpo gpp gpr gps gpt gra grb grg gri gro grp grr grs grt gsa gsb gsg gsi gso gsp gsr gss gst gta gtb gtg gti gto gtp gtr gts gtt ia- iaa iab iag iai iao iap iar ias iat iba ibb ibg ibi ibo ibp ibr ibs ibt iga igb igg igi igo igp igr igs igt iia iib iii iio iip iir iis iit io- ioa iob iog ioi ioo iop ior ios iot ipa ipb ipg ipi ipo ipp ipr ips ipt ir- ira irb irg iri iro irp irr irs irt is- isa isb isg isi iso isp isr iss ist ita itb itg iti ito itp its itt o-i oaa oab oag oai oao oap oar oas oat ob- oba obb obg obi obo obp obr obs obt oga ogg ogi ogo ogp ogs ogt oia oib oii oio oip oir ois oit oo- ooa oob oog ooi ooo oop oor oos oot op- opa opb opg opi opo opp opr ops opt or- ora orb org ori oro orp orr ors ort os- osa osb osg osi oso osp osr oss ost ot- ota otb otg oti oto otp otr ots ott p-p paa pab pag pai pao pap par pas pat pba pbb pbg pbi pbo pbp pbr pbs pbt pga pgb pgg pgi pgo pgp pgr pgs pgt pia pib pig pii pio pip pir pis pit poa pob pog poi poo pop por pos pot ppa ppb ppg ppi ppo ppp ppr pps ppt pra prb prg pri pro prp prr prs prt ps- psa psb psg psi pso psp psr pss pst pt- pta ptb ptg pti pto ptp ptr pts ptt ra- raa rab rag rai rao rap rar ras rat rba rbb rbg rbi rbo rbp rbr rbs rbt rga rgb rgg rgi rgo rgp rgr rgs rgt ria rib rig rii rio rip rir ris rit roa rob rog roi roo rop ror ros rot rpa rpb rpg rpi rpo rpp rpr rps rpt rra rrb rrg rri rrp rrr rrs rrt rsa rsb rsg rsi rso rsp rsr rss rst rta rtb rtg rti rto rtp rtr rts rtt saa sab sag sai sao sap sar sas sat sba sbb sbg sbi sbo sbp sbr sbs sbt sga sgb sgg sgi sgo sgp sgr sgs sgt sia sib sig sii sio sip sir sis sit soa sob sog soi soo sop sor sos sot spa spb spg spi spo spp spr sps spt sr- sra srb srg sri sro srp srr srs srt ss- ssa ssb ssg ssi sso ssp ssr sss sst sta stb stg sti sto stp str sts stt taa tab tag tai tao tap tar tas tat tba tbb tbg tbi tbo tbp tbr tbs tbt tga tgb tgg tgi tgo tgp tgr tgs tgt tia tib tig tii tio tip tir tis tit to- toa tob tog toi too top tor tos tot tpa tpb tpg tpi tpo tpp tpr tps tpt tra trb trg tri tro trp trr trs trt tsa tsb tsg tsi tso tsp tsr tss tst tta ttb ttg tti tto ttp ttr tts ttt