a-a a-b aaa aab aag aam aao aas ab- aba abb abg abm abo abs ag- aga agb agg agm ago ags ama amb amg amm amo ams aoa aob aog aom aoo aos as- asa asb asg asm aso ass baa bab bag bam bao bas bba bbb bbg bbm bbo bbs bga bgb bgg bgm bgo bgs bma bmb bmg bmm bmo bms boa bob bog bom boo bos bsa bsb bsg bsm bso bss gaa gab gag gam gao gas gba gbg gbm gbo gbs gga ggb ggg ggm ggo ggs gma gmb gmg gmm gmo gms goa gob gog gom goo gos gsa gsb gsg gsm gso gss m-o maa mab mag mam mao mas mba mbb mbg mbm mbo mbs mga mgb mgm mgo mgs mma mmb mmg mmm mmo mms moa mob mog mom moo mos msa msb msg msm mso mss oaa oab oag oam oao oas ob- oba obb obg obm obo obs oga ogg ogo ogs om- oma omb omg omm omo oms oo- ooa oob oog oom ooo oos os- osa osb osg osm oso oss saa sab sag sam sao sas sba sbb sbg sbm sbo sbs sga sgb sgg sgm sgo sgs sma smb smg smm smo sms soa sob sog som soo sos ss- ssa ssb ssg ssm sso sss