-al -ol a-a a-b aaa aab aaf aal aan aao aau ab- aba abb abf abl abn abo abu af- afa afb aff afl afn afo afu al- ala alb alf all aln alo alu an- ana anb anf anl ann ano anu aoa aob aof aol aon aoo aou au- aua aub auf aul aun auo b-u baa bab baf bal ban bao bau bba bbb bbf bbl bbn bbo bbu bfa bfb bff bfl bfn bfo bfu bla blb blf bll bln blo blu bna bnb bnf bnl bnn bno bnu boa bob bof bol bon boo bou bua bub buf bul bun buo buu faa fab faf fal fan fao fau fba fbb fbf fbl fbn fbo fbu ffa fff ffl ffn ffo ffu fla flb flf fll fln flo flu fna fnb fnf fnl fnn fnu foa fob fof fol fon foo fou fua fub fuf ful fun fuo fuu la- laa lab laf lal lan lao lau lba lbb lbf lbl lbo lbu lfa lfb lff lfl lfn lfo lfu lla llb llf lll lln llo llu lna lnb lnl lnn lno lnu loa lob lof lol lon loo lou lua lub luf lul lun luo luu naa nab naf nal nan nao nau nba nbb nbf nbl nbn nbo nbu nfa nfb nff nfl nfn nfo nfu nla nlb nlf nll nln nlo nlu nna nnb nnf nnl nnn nno nnu no- noa nob nof nol non noo nou nua nub nul nun nuo nuu oaa oab oaf oal oan oao oau ob- oba obb obf obl obn obo obu of- ofa ofb off ofl ofn ofo ofu ola olb olf oll oln olo olu on- ona onb onf onl onn ono onu oo- ooa oob oof ool oon ooo ou- oua ouf oul oun ouo ua- uaa uab uaf ual uan uao uau uba ubb ubf ubl ubn ubo ubu ufa uff ufl ufn ufo ufu ula ulb ulf ull uln ulo ulu un- una unb unf unl unn uno unu uoa uob uol uon uoo uua uun uuu