-al -ol a-a a-b a-c aaa aab aac aae aal aan aao aau ab- aba abb abc abe abl abn abo abu ac- aca acb acc ace acl acn aco acu aea aeb aec aee ael aen aeo aeu al- ala alb alc ale all aln alo alu an- ana anb anc ane anl ann ano anu aoa aob aoc aoe aol aon aoo aou au- aua aub auc aue aul aun auo b-u baa bab bac bae bal ban bao bau bba bbb bbc bbe bbl bbn bbo bbu bca bcb bcc bce bcl bcn bco bcu be- bea beb bec bee bel ben beo beu bla blb blc ble bll bln blo blu bna bnb bnc bne bnl bnn bno bnu boa bob boc boe bol bon boo bou bua bub buc bue bul bun buo buu c-- caa cab cac cae cal can cao cau cba cbb cbc cbe cbl cbn cbo cbu cca ccb ccc cce ccl ccn cco ccu ce- cea ceb cec cee cel cen ceo ceu cl- cla clb clc cle cll cln clo clu cn- cna cnb cnc cne cnl cnn cno cnu co- coa cob coc coe col con coo cou cua cub cuc cue cul cun cuo cuu eaa eab eac eae eal ean eao eau eba ebb ebc ebe ebl ebn ebo ebu ec- eca ecb ecc ece ecl ecn eco ecu eea eeb eec eee eel een eeo ela elb elc ele ell eln elo elu en- ena enb enc ene enl enn eno enu eo- eoa eob eoc eoe eol eon eoo eou eu- eua eub euc eue eul eun la- laa lab lac lae lal lan lao lau lba lbb lbc lbe lbl lbo lbu lca lcb lcc lce lcl lcn lco lcu lea leb lec lee lel len leo leu lla llb llc lle lll lln llo llu lna lnb lnc lne lnl lnn lno lnu loa lob loc loe lol lon loo lou lua lub luc lue lul lun luo luu naa nab nac nae nal nan nao nau nba nbb nbc nbe nbl nbn nbo nbu nca ncb ncc nce ncl ncn nco ncu ne- nea neb nec nee nel nen neo neu nla nlb nlc nle nll nln nlo nlu nna nnb nnc nne nnl nnn nno nnu no- noa nob noc noe nol non noo nou nua nub nuc nue nul nun nuo nuu oaa oab oac oae oal oan oao oau ob- oba obb obc obe obl obn obo obu oc- oca ocb occ ocl ocn oco ocu oea oeb oec oee oel oen oeo ola olb olc ole oll oln olo olu on- ona onb onc one onl onn ono onu oo- ooa oob ooc ool oon ooo ou- oua ouc oue oul oun ouo ua- uaa uab uac uae ual uan uao uau uba ubb ubc ube ubl ubn ubo ubu uca ucb ucc uce ucl ucn uco ucu uea ueb uec uee uel uen ula ulb ulc ule ull uln ulo ulu un- una unb unc une unl unn uno unu uoa uob uoc uoe uol uon uoo uua uuc uue uun uuu