-al -ol a-a a-b aaa aab aad aak aal aao ab- aba abb abd abk abl abo ad- ada adb add adk adl ado aka akb akd akk akl ako al- ala alb ald alk all alo aoa aob aod aok aol aoo baa bab bad bak bal bao bba bbb bbd bbk bbl bbo bda bdb bdd bdk bdl bdo bka bkb bkk bkl bko bla blb bld blk bll blo boa bob bod bok bol boo daa dab dad dak dal dao dba dbb dbd dbk dbl dbo dda ddb ddd ddk ddl ddo dka dkb dkk dkl dko dl- dla dlb dld dlk dll dlo doa dob dod dok dol doo ka- kaa kab kad kak kal kao kba kbb kbd kbk kbl kbo kda kdb kdk kdl kdo kkb kkk kkl kl- kla klb kld klo koa kob kod kok kol koo la- laa lab lad lak lal lao lba lbb lbd lbk lbl lbo lda ldb ldd ldk ldl ldo lka lkb lkl lla llb lld llk lll llo loa lob lod lok lol loo oaa oab oad oak oal oao ob- oba obb obd obk obl obo oda odb odd odl odo oka okb okd okk okl oko ola olb old olk oll olo oo- ooa oob ood ook ool ooo