a-a a-b aaa aab aag aam aao aar aas ab- aba abb abg abm abo abr abs ag- aga agb agg agm ago agr ags ama amb amg amm amo amr ams aoa aob aog aom aoo aor aos ar- ara arb arg arm aro arr ars as- asa asb asg asm aso asr ass baa bab bag bam bao bar bas bba bbb bbg bbm bbo bbr bbs bga bgb bgg bgm bgo bgr bgs bma bmb bmg bmm bmo bmr bms boa bob bog bom boo bor bos bra brb brg brm bro brr brs bsa bsb bsg bsm bso bsr bss gaa gab gag gam gao gar gas gba gbg gbm gbo gbr gbs gga ggb ggg ggm ggo ggr ggs gma gmb gmg gmm gmo gmr gms goa gob gog gom goo gor gos gra grb grg grm gro grr grs gsa gsb gsg gsm gso gsr gss m-o m-r maa mab mag mam mao mar mas mba mbb mbg mbm mbo mbr mbs mga mgb mgm mgo mgr mgs mma mmb mmg mmm mmo mmr mms moa mob mog mom moo mor mos mra mrb mrg mrm mro mrr mrs msa msb msg msm mso msr mss oaa oab oag oam oao oar oas ob- oba obb obg obm obo obr obs oga ogg ogo ogs om- oma omb omg omm omo omr oms oo- ooa oob oog oom ooo oor oos or- ora orb org orm oro orr ors os- osa osb osg osm oso osr oss ra- raa rab rag ram rao rar ras rba rbb rbg rbm rbo rbr rbs rga rgb rgg rgo rgr rgs rma rmb rmg rmm rmo rmr rms roa rob rog rom roo ror ros rra rrb rrg rrm rrr rrs rsa rsb rsg rsm rso rsr rss saa sab sag sam sao sar sas sba sbb sbg sbm sbo sbr sbs sga sgb sgg sgm sgo sgr sgs sma smb smg smm smo smr sms soa sob sog som soo sor sos sr- sra srb srg srm sro srr srs ss- ssa ssb ssg ssm sso ssr sss