a-a a-b a-c aaa aab aac aag aak aam aao aas ab- aba abb abc abg abk abm abo abs ac- aca acb acc acg ack acm aco acs ag- aga agb agc agg agk agm ago ags aka akb akc akg akk akm ako aks ama amb amc amg amk amm amo ams aoa aob aoc aog aok aom aoo aos as- asa asb asc asg ask asm aso ass baa bab bac bag bak bam bao bas bba bbb bbc bbg bbk bbm bbo bbs bca bcb bcc bcg bck bcm bco bcs bga bgb bgc bgg bgk bgm bgo bgs bka bkb bkc bkg bkk bkm bko bks bma bmb bmc bmg bmk bmm bmo bms boa bob boc bog bok bom boo bos bsa bsb bsc bsg bsk bsm bso bss c-- caa cab cac cag cak cam cao cas cba cbb cbc cbg cbk cbm cbo cbs cca ccb ccc ccg cck ccm cco ccs cga cgb cgc cgg cgm cgo cgs cka ckb ckc ckm cko cks cma cmb cmc cmg cmk cmm cmo cms co- coa cob coc cog cok com coo cos csa csb csc csg csk csm cso css gaa gab gac gag gak gam gao gas gba gbc gbg gbk gbm gbo gbs gca gcb gcc gcg gck gcm gco gcs gga ggb ggc ggg ggm ggo ggs gka gkb gkm gko gks gma gmb gmc gmg gmm gmo gms goa gob goc gog gok gom goo gos gsa gsb gsc gsg gsk gsm gso gss ka- kaa kab kac kag kak kam kao kas kba kbb kbc kbk kbm kbo kbs kca kcb kcc kcg kck kcm kcs kga kgb kgc kgm kgo kgs kkb kkc kkk kkm kks kma kmb kmc kmg kmk kmm kmo kms koa kob koc kog kok kom koo kos ksa ksb ksc ksg ksk ksm kso kss m-o maa mab mac mag mak mam mao mas mba mbb mbc mbg mbk mbm mbo mbs mc- mca mcb mcc mcg mck mcm mco mcs mga mgb mgc mgk mgm mgo mgs mka mkb mkc mkg mkk mkm mko mks mma mmb mmc mmg mmk mmm mmo mms moa mob moc mog mok mom moo mos msa msb msc msg msk msm mso mss oaa oab oac oag oak oam oao oas ob- oba obb obc obg obk obm obo obs oc- oca ocb occ ocg ock ocm oco ocs oga ogc ogg ogo ogs oka okb okc okg okk oko oks om- oma omb omc omg omm omo oms oo- ooa oob ooc oog ook oom ooo oos os- osa osb osc osg osk osm oso oss saa sab sac sag sak sam sao sas sba sbb sbc sbg sbk sbm sbo sbs sca scb scc scg sck scm sco scs sga sgb sgc sgg sgk sgm sgo sgs sk- ska skb skc skg skk skm sko sks sma smb smc smg smk smm smo sms soa sob soc sog sok som soo sos ss- ssa ssb ssc ssg ssk ssm sso sss