-al -ol a-a a-b aaa aab aak aal aao ab- aba abb abk abl abo aka akb akk akl ako al- ala alb alk all alo aoa aob aok aol aoo baa bab bak bal bao bba bbb bbk bbl bbo bka bkb bkk bkl bko bla blb blk bll blo boa bob bok bol boo ka- kaa kab kak kal kao kba kbb kbk kbl kbo kkb kkk kkl kl- kla klb klo koa kob kok kol koo la- laa lab lak lal lao lba lbb lbk lbl lbo lka lkb lkl lla llb llk lll llo loa lob lok lol loo oaa oab oak oal oao ob- oba obb obk obl obo oka okb okk okl oko ola olb olk oll olo oo- ooa oob ook ool ooo