-al -ol a-a a-b a-t aaa aab aal aan aao aat ab- aba abb abl abn abo abt al- ala alb all aln alo alt an- ana anb anl ann ano ant aoa aob aol aon aoo aot at- ata atb atl atn ato att baa bab bal ban bao bat bba bbb bbl bbn bbo bbt bla blb bll bln blo blt bna bnb bnl bnn bno bnt boa bob bol bon boo bot bta btb btl btn bto btt la- laa lab lal lan lao lat lba lbb lbl lbo lbt lla llb lll lln llo llt lna lnb lnl lnn lno lnt loa lob lol lon loo lot lta ltb ltl lto ltt naa nab nal nan nao nat nba nbb nbl nbn nbo nbt nla nlb nll nln nlo nlt nna nnb nnl nnn nno nnt no- noa nob nol non noo not nta ntb ntn nto ntt oaa oab oal oan oao oat ob- oba obb obl obn obo obt ola olb oll oln olo olt on- ona onb onl onn ono ont oo- ooa oob ool oon ooo oot ot- ota otb otl otn oto ott taa tab tal tan tao tat tba tbb tbl tbn tbo tbt tla tll tln tlo tlt tna tnb tnl tnn tno tnt to- toa tob tol ton too tot tta ttb ttl ttn tto ttt