-al a-a a-b a-c aaa aab aac aae aal aan aau ab- aba abb abc abe abl abn abu ac- aca acb acc ace acl acn acu aea aeb aec aee ael aen aeu al- ala alb alc ale all aln alu an- ana anb anc ane anl ann anu au- aua aub auc aue aul aun b-u baa bab bac bae bal ban bau bba bbb bbc bbe bbl bbn bbu bca bcb bcc bce bcl bcn bcu be- bea beb bec bee bel ben beu bla blb blc ble bll bln blu bna bnb bnc bne bnl bnn bnu bua bub buc bue bul bun buu c-- caa cab cac cae cal can cau cba cbb cbc cbe cbl cbn cbu cca ccb ccc cce ccl ccn ccu ce- cea ceb cec cee cel cen ceu cl- cla clb clc cle cll cln clu cn- cna cnb cnc cne cnl cnn cnu cua cub cuc cue cul cun cuu eaa eab eac eae eal ean eau eba ebb ebc ebe ebl ebn ebu ec- eca ecb ecc ece ecl ecn ecu eea eeb eec eee eel een ela elb elc ele ell eln elu en- ena enb enc ene enl enn enu eu- eua eub euc eue eul eun la- laa lab lac lae lal lan lau lba lbb lbc lbe lbl lbu lca lcb lcc lce lcl lcn lcu lea leb lec lee lel len leu lla llb llc lle lll lln llu lna lnb lnc lne lnl lnn lnu lua lub luc lue lul lun luu naa nab nac nae nal nan nau nba nbb nbc nbe nbl nbn nbu nca ncb ncc nce ncl ncn ncu ne- nea neb nec nee nel nen neu nla nlb nlc nle nll nln nlu nna nnb nnc nne nnl nnn nnu nua nub nuc nue nul nun nuu ua- uaa uab uac uae ual uan uau uba ubb ubc ube ubl ubn ubu uca ucb ucc uce ucl ucn ucu uea ueb uec uee uel uen ula ulb ulc ule ull uln ulu un- una unb unc une unl unn unu uua uuc uue uun uuu