a-a a-b aaa aab aag aam aan aao aas ab- aba abb abg abm abn abo abs ag- aga agb agg agm agn ago ags ama amb amg amm amn amo ams an- ana anb ang anm ann ano ans aoa aob aog aom aon aoo aos as- asa asb asg asm asn aso ass baa bab bag bam ban bao bas bba bbb bbg bbm bbn bbo bbs bga bgb bgg bgm bgn bgo bgs bma bmb bmg bmm bmn bmo bms bna bnb bng bnn bno bns boa bob bog bom bon boo bos bsa bsb bsg bsm bsn bso bss gaa gab gag gam gan gao gas gba gbg gbm gbn gbo gbs gga ggb ggg ggm ggn ggo ggs gma gmb gmg gmm gmn gmo gms gna gnb gnm gnn gno gns goa gob gog gom gon goo gos gsa gsb gsg gsm gsn gso gss m-o maa mab mag mam man mao mas mba mbb mbg mbm mbo mbs mga mgb mgm mgn mgo mgs mma mmb mmg mmm mmn mmo mms mna mnb mng mnm mnn mno mns moa mob mog mom mon moo mos msa msb msg msm msn mso mss naa nab nag nam nan nao nas nba nbb nbg nbm nbn nbo nbs nga ngb ngg ngm ngn ngo ngs nma nmb nmg nmm nmn nmo nms nna nnb nng nnm nnn nno nns no- noa nob nog nom non noo nos nsa nsb nsg nsm nsn nso nss oaa oab oag oam oan oao oas ob- oba obb obg obm obn obo obs oga ogg ogn ogo ogs om- oma omb omg omm omn omo oms on- ona onb ong onn ono ons oo- ooa oob oog oom oon ooo oos os- osa osb osg osm osn oso oss saa sab sag sam san sao sas sba sbb sbg sbm sbn sbo sbs sga sgb sgg sgm sgn sgo sgs sma smb smg smm smn smo sms sna snb sng snm snn sno sns soa sob sog som son soo sos ss- ssa ssb ssg ssm ssn sso sss