-al -ol a-a a-b a-c aaa aab aac aal aan aao aau ab- aba abb abc abl abn abo abu ac- aca acb acc acl acn aco acu al- ala alb alc all aln alo alu an- ana anb anc anl ann ano anu aoa aob aoc aol aon aoo aou au- aua aub auc aul aun auo b-u baa bab bac bal ban bao bau bba bbb bbc bbl bbn bbo bbu bca bcb bcc bcl bcn bco bcu bla blb blc bll bln blo blu bna bnb bnc bnl bnn bno bnu boa bob boc bol bon boo bou bua bub buc bul bun buo buu c-- caa cab cac cal can cao cau cba cbb cbc cbl cbn cbo cbu cca ccb ccc ccl ccn cco ccu cl- cla clb clc cll cln clo clu cn- cna cnb cnc cnl cnn cno cnu co- coa cob coc col con coo cou cua cub cuc cul cun cuo cuu la- laa lab lac lal lan lao lau lba lbb lbc lbl lbo lbu lca lcb lcc lcl lcn lco lcu lla llb llc lll lln llo llu lna lnb lnc lnl lnn lno lnu loa lob loc lol lon loo lou lua lub luc lul lun luo luu naa nab nac nal nan nao nau nba nbb nbc nbl nbn nbo nbu nca ncb ncc ncl ncn nco ncu nla nlb nlc nll nln nlo nlu nna nnb nnc nnl nnn nno nnu no- noa nob noc nol non noo nou nua nub nuc nul nun nuo nuu oaa oab oac oal oan oao oau ob- oba obb obc obl obn obo obu oc- oca ocb occ ocl ocn oco ocu ola olb olc oll oln olo olu on- ona onb onc onl onn ono onu oo- ooa oob ooc ool oon ooo ou- oua ouc oul oun ouo ua- uaa uab uac ual uan uao uau uba ubb ubc ubl ubn ubo ubu uca ucb ucc ucl ucn uco ucu ula ulb ulc ull uln ulo ulu un- una unb unc unl unn uno unu uoa uob uoc uol uon uoo uua uuc uun uuu