a-a a-b a-i aaa aab aag aai aam aao aar aas ab- aba abb abg abi abm abo abr abs ag- aga agb agg agi agm ago agr ags ai- aia aib aig aii aim aio air ais ama amb amg ami amm amo amr ams aoa aob aog aoi aom aoo aor aos ar- ara arb arg ari arm aro arr ars as- asa asb asg asi asm aso asr ass baa bab bag bai bam bao bar bas bba bbb bbg bbi bbm bbo bbr bbs bga bgb bgg bgi bgm bgo bgr bgs bi- bia bib big bii bim bio bir bis bma bmb bmg bmi bmm bmo bmr bms boa bob bog boi bom boo bor bos bra brb brg bri brm bro brr brs bsa bsb bsg bsi bsm bso bsr bss gaa gab gag gai gam gao gar gas gba gbg gbi gbm gbo gbr gbs gga ggb ggg ggi ggm ggo ggr ggs gia gib gig gii gim gio gir gis gma gmb gmg gmi gmm gmo gmr gms goa gob gog goi gom goo gor gos gra grb grg gri grm gro grr grs gsa gsb gsg gsi gsm gso gsr gss ia- iaa iab iag iai iam iao iar ias iba ibb ibg ibi ibm ibo ibr ibs iga igb igg igi igm igo igr igs iia iib iii iim iio iir iis im- ima imb img imi imm imo ims io- ioa iob iog ioi iom ioo ior ios ir- ira irb irg iri irm iro irr irs is- isa isb isg isi ism iso isr iss m-o m-r maa mab mag mai mam mao mar mas mba mbb mbg mbi mbm mbo mbr mbs mga mgb mgi mgm mgo mgr mgs mi- mia mib mig mii mim mio mir mis mma mmb mmg mmi mmm mmo mmr mms moa mob mog moi mom moo mor mos mra mrb mrg mri mrm mro mrr mrs msa msb msg msi msm mso msr mss o-i oaa oab oag oai oam oao oar oas ob- oba obb obg obi obm obo obr obs oga ogg ogi ogo ogs oia oib oii oim oio oir ois om- oma omb omg omi omm omo omr oms oo- ooa oob oog ooi oom ooo oor oos or- ora orb org ori orm oro orr ors os- osa osb osg osi osm oso osr oss ra- raa rab rag rai ram rao rar ras rba rbb rbg rbi rbm rbo rbr rbs rga rgb rgg rgi rgo rgr rgs ria rib rig rii rim rio rir ris rma rmb rmg rmi rmm rmo rmr rms roa rob rog roi rom roo ror ros rra rrb rrg rri rrm rrr rrs rsa rsb rsg rsi rsm rso rsr rss saa sab sag sai sam sao sar sas sba sbb sbg sbi sbm sbo sbr sbs sga sgb sgg sgi sgm sgo sgr sgs sia sib sig sii sim sio sir sis sma smb smg smi smm smo smr sms soa sob sog soi som soo sor sos sr- sra srb srg sri srm sro srr srs ss- ssa ssb ssg ssi ssm sso ssr sss