-al a-a a-b a-c aaa aab aac aae aaf aal aan aau ab- aba abb abc abe abf abl abn abu ac- aca acb acc ace acf acl acn acu aea aeb aec aee aef ael aen aeu af- afa afb afc afe aff afl afn afu al- ala alb alc ale alf all aln alu an- ana anb anc ane anf anl ann anu au- aua aub auc aue auf aul aun b-u baa bab bac bae baf bal ban bau bba bbb bbc bbe bbf bbl bbn bbu bca bcb bcc bce bcf bcl bcn bcu be- bea beb bec bee bef bel ben beu bfa bfb bfc bfe bff bfl bfn bfu bla blb blc ble blf bll bln blu bna bnb bnc bne bnf bnl bnn bnu bua bub buc bue buf bul bun buu c-- caa cab cac cae caf cal can cau cba cbb cbc cbe cbf cbl cbn cbu cca ccb ccc cce ccf ccl ccn ccu ce- cea ceb cec cee cef cel cen ceu cfa cfb cfc cfe cff cfl cfn cfu cl- cla clb clc cle clf cll cln clu cn- cna cnb cnc cne cnf cnl cnn cnu cua cub cuc cue cuf cul cun cuu eaa eab eac eae eaf eal ean eau eba ebb ebc ebe ebf ebl ebn ebu ec- eca ecb ecc ece ecf ecl ecn ecu eea eeb eec eee eef eel een ef- efa efb efc efe eff efl ela elb elc ele elf ell eln elu en- ena enb enc ene enf enl enn enu eu- eua eub euc eue euf eul eun faa fab fac fae faf fal fan fau fba fbb fbc fbe fbf fbl fbn fbu fca fcb fcc fce fcf fcl fcn fcu fea feb fec fee fef fel fen feu ffa ffc ffe fff ffl ffn ffu fla flb flc fle flf fll fln flu fna fnb fnc fne fnf fnl fnn fnu fua fub fue fuf ful fun fuu la- laa lab lac lae laf lal lan lau lba lbb lbc lbe lbf lbl lbu lca lcb lcc lce lcf lcl lcn lcu lea leb lec lee lef lel len leu lfa lfb lfc lfe lff lfl lfn lfu lla llb llc lle llf lll lln llu lna lnb lnc lne lnl lnn lnu lua lub luc lue luf lul lun luu naa nab nac nae naf nal nan nau nba nbb nbc nbe nbf nbl nbn nbu nca ncb ncc nce ncf ncl ncn ncu ne- nea neb nec nee nef nel nen neu nfa nfb nfc nfe nff nfl nfn nfu nla nlb nlc nle nlf nll nln nlu nna nnb nnc nne nnf nnl nnn nnu nua nub nuc nue nul nun nuu ua- uaa uab uac uae uaf ual uan uau uba ubb ubc ube ubf ubl ubn ubu uca ucb ucc uce ucf ucl ucn ucu uea ueb uec uee uef uel uen ufa ufc ufe uff ufl ufn ufu ula ulb ulc ule ulf ull uln ulu un- una unb unc une unf unl unn unu uua uuc uue uun uuu