a-a a-b aaa aab aad aak aam aao aas ab- aba abb abd abk abm abo abs ad- ada adb add adk adm ado ads aka akb akd akk akm ako aks ama amb amd amk amm amo ams aoa aob aod aok aom aoo aos as- asa asb asd ask asm aso ass baa bab bad bak bam bao bas bba bbb bbd bbk bbm bbo bbs bda bdb bdd bdk bdm bdo bds bka bkb bkk bkm bko bks bma bmb bmd bmk bmm bmo bms boa bob bod bok bom boo bos bsa bsb bsd bsk bsm bso bss daa dab dad dak dam dao das dba dbb dbd dbk dbm dbo dbs dda ddb ddd ddk ddm ddo dds dka dkb dkk dkm dko dks dma dmb dmd dmk dmm dmo dms doa dob dod dok dom doo dos dsa dsb dsd dsk dsm dso dss ka- kaa kab kad kak kam kao kas kba kbb kbd kbk kbm kbo kbs kda kdb kdk kdm kdo kds kkb kkk kkm kks kma kmb kmd kmk kmm kmo kms koa kob kod kok kom koo kos ksa ksb ksd ksk ksm kso kss m-o maa mab mad mak mam mao mas mba mbb mbd mbk mbm mbo mbs mda mdb mdd mdk mdm mdo mds mka mkb mkd mkk mkm mko mks mma mmb mmd mmk mmm mmo mms moa mob mod mok mom moo mos msa msb msd msk msm mso mss oaa oab oad oak oam oao oas ob- oba obb obd obk obm obo obs oda odb odd odm odo ods oka okb okd okk oko oks om- oma omb omd omm omo oms oo- ooa oob ood ook oom ooo oos os- osa osb osd osk osm oso oss saa sab sad sak sam sao sas sba sbb sbd sbk sbm sbo sbs sda sdb sdd sdk sdm sdo sds sk- ska skb skd skk skm sko sks sma smb smd smk smm smo sms soa sob sod sok som soo sos ss- ssa ssb ssd ssk ssm sso sss