-al -ol a-a a-b a-c a-t aaa aab aac aal aan aao aat ab- aba abb abc abl abn abo abt ac- aca acb acc acl acn aco act al- ala alb alc all aln alo alt an- ana anb anc anl ann ano ant aoa aob aoc aol aon aoo aot at- ata atb atc atl atn ato att baa bab bac bal ban bao bat bba bbb bbc bbl bbn bbo bbt bca bcb bcc bcl bcn bco bct bla blb blc bll bln blo blt bna bnb bnc bnl bnn bno bnt boa bob boc bol bon boo bot bta btb btc btl btn bto btt c-- caa cab cac cal can cao cat cba cbb cbc cbl cbn cbo cbt cca ccb ccc ccl ccn cco cct cl- cla clb clc cll cln clo clt cn- cna cnb cnc cnl cnn cno cnt co- coa cob coc col con coo cot cta ctb ctc ctl ctn cto ctt la- laa lab lac lal lan lao lat lba lbb lbc lbl lbo lbt lca lcb lcc lcl lcn lco lct lla llb llc lll lln llo llt lna lnb lnc lnl lnn lno lnt loa lob loc lol lon loo lot lta ltb ltc ltl lto ltt naa nab nac nal nan nao nat nba nbb nbc nbl nbn nbo nbt nca ncb ncc ncl ncn nco nct nla nlb nlc nll nln nlo nlt nna nnb nnc nnl nnn nno nnt no- noa nob noc nol non noo not nta ntb ntc ntn nto ntt oaa oab oac oal oan oao oat ob- oba obb obc obl obn obo obt oc- oca ocb occ ocl ocn oco oct ola olb olc oll oln olo olt on- ona onb onc onl onn ono ont oo- ooa oob ooc ool oon ooo oot ot- ota otb otc otl otn oto ott taa tab tac tal tan tao tat tba tbb tbc tbl tbn tbo tbt tca tcb tcc tcl tcn tco tct tla tlc tll tln tlo tlt tna tnb tnc tnl tnn tno tnt to- toa tob toc tol ton too tot tta ttb ttc ttl ttn tto ttt