-al -ol a-a a-b aaa aab aak aal aan aao ab- aba abb abk abl abn abo aka akb akk akl akn ako al- ala alb alk all aln alo an- ana anb ank anl ann ano aoa aob aok aol aon aoo baa bab bak bal ban bao bba bbb bbk bbl bbn bbo bka bkb bkk bkl bkn bko bla blb blk bll bln blo bna bnb bnk bnl bnn bno boa bob bok bol bon boo ka- kaa kab kak kal kan kao kba kbb kbk kbl kbn kbo kkb kkk kkl kkn kl- kla klb klo kn- kna knk knl knn kno koa kob kok kol kon koo la- laa lab lak lal lan lao lba lbb lbk lbl lbo lka lkb lkl lla llb llk lll lln llo lna lnb lnk lnl lnn lno loa lob lok lol lon loo naa nab nak nal nan nao nba nbb nbk nbl nbn nbo nka nkk nkn nko nla nlb nlk nll nln nlo nna nnb nnk nnl nnn nno no- noa nob nok nol non noo oaa oab oak oal oan oao ob- oba obb obk obl obn obo oka okb okk okl oko ola olb olk oll oln olo on- ona onb onk onl onn ono oo- ooa oob ook ool oon ooo