a-a a-b a-t aaa aab aag aao aap aar aas aat ab- aba abb abg abo abp abr abs abt ag- aga agb agg ago agp agr ags agt aoa aob aog aoo aop aor aos aot ap- apa apb apg apo app apr aps apt ar- ara arb arg aro arp arr ars art as- asa asb asg aso asp asr ass ast at- ata atb atg ato atp atr ats att b-p baa bab bag bao bap bar bas bat bba bbb bbg bbo bbp bbr bbs bbt bga bgb bgg bgo bgp bgr bgs bgt boa bob bog boo bop bor bos bot bpa bpb bpg bpo bpp bpr bps bpt bra brb brg bro brp brr brs brt bsa bsb bsg bso bsp bsr bss bst bta btb btg bto btp btr bts btt g-p gaa gab gag gao gap gar gas gat gba gbg gbo gbp gbr gbs gbt gga ggb ggg ggo ggp ggr ggs ggt goa gob gog goo gop gor gos got gpa gpb gpg gpo gpp gpr gps gpt gra grb grg gro grp grr grs grt gsa gsb gsg gso gsp gsr gss gst gta gtb gtg gto gtp gtr gts gtt oaa oab oag oao oap oar oas oat ob- oba obb obg obo obp obr obs obt oga ogg ogo ogp ogs ogt oo- ooa oob oog ooo oop oor oos oot op- opa opb opg opo opp opr ops opt or- ora orb org oro orp orr ors ort os- osa osb osg oso osp osr oss ost ot- ota otb otg oto otp otr ots ott p-p paa pab pag pao pap par pas pat pba pbb pbg pbo pbp pbr pbs pbt pga pgb pgg pgo pgp pgr pgs pgt poa pob pog poo pop por pos pot ppa ppb ppg ppo ppp ppr pps ppt pra prb prg pro prp prr prs prt ps- psa psb psg pso psp psr pss pst pt- pta ptb ptg pto ptp ptr pts ptt ra- raa rab rag rao rap rar ras rat rba rbb rbg rbo rbp rbr rbs rbt rga rgb rgg rgo rgp rgr rgs rgt roa rob rog roo rop ror ros rot rpa rpb rpg rpo rpp rpr rps rpt rra rrb rrg rrp rrr rrs rrt rsa rsb rsg rso rsp rsr rss rst rta rtb rtg rto rtp rtr rts rtt saa sab sag sao sap sar sas sat sba sbb sbg sbo sbp sbr sbs sbt sga sgb sgg sgo sgp sgr sgs sgt soa sob sog soo sop sor sos sot spa spb spg spo spp spr sps spt sr- sra srb srg sro srp srr srs srt ss- ssa ssb ssg sso ssp ssr sss sst sta stb stg sto stp str sts stt taa tab tag tao tap tar tas tat tba tbb tbg tbo tbp tbr tbs tbt tga tgb tgg tgo tgp tgr tgs tgt to- toa tob tog too top tor tos tot tpa tpb tpg tpo tpp tpr tps tpt tra trb trg tro trp trr trs trt tsa tsb tsg tso tsp tsr tss tst tta ttb ttg tto ttp ttr tts ttt