-al -ol a-a a-b aaa aab aaf aak aal aan aao ab- aba abb abf abk abl abn abo af- afa afb aff afk afl afn afo aka akb akk akl akn ako al- ala alb alf alk all aln alo an- ana anb anf ank anl ann ano aoa aob aof aok aol aon aoo baa bab baf bak bal ban bao bba bbb bbf bbk bbl bbn bbo bfa bfb bff bfl bfn bfo bka bkb bkf bkk bkl bkn bko bla blb blf blk bll bln blo bna bnb bnf bnk bnl bnn bno boa bob bof bok bol bon boo faa fab faf fak fal fan fao fba fbb fbf fbk fbl fbn fbo ffa fff ffk ffl ffn ffo fka fkb fkf fkk fkl fla flb flf fll fln flo fna fnb fnf fnk fnl fnn foa fob fof fok fol fon foo ka- kaa kab kaf kak kal kan kao kba kbb kbf kbk kbl kbn kbo kfa kff kfo kkb kkk kkl kkn kl- kla klb klf klo kn- kna knf knk knl knn kno koa kob kof kok kol kon koo la- laa lab laf lak lal lan lao lba lbb lbf lbk lbl lbo lfa lfb lff lfk lfl lfn lfo lka lkb lkl lla llb llf llk lll lln llo lna lnb lnk lnl lnn lno loa lob lof lok lol lon loo naa nab naf nak nal nan nao nba nbb nbf nbk nbl nbn nbo nfa nfb nff nfk nfl nfn nfo nka nkf nkk nkn nko nla nlb nlf nlk nll nln nlo nna nnb nnf nnk nnl nnn nno no- noa nob nof nok nol non noo oaa oab oaf oak oal oan oao ob- oba obb obf obk obl obn obo of- ofa ofb off ofl ofn ofo oka okb okk okl oko ola olb olf olk oll oln olo on- ona onb onf onk onl onn ono oo- ooa oob oof ook ool oon ooo