-al a-a a-b a-c aaa aab aac aae aaf aag aak aal aan ab- aba abb abc abe abf abg abk abl abn ac- aca acb acc ace acf acg ack acl acn aea aeb aec aee aef aeg aek ael aen af- afa afb afc afe aff afg afk afl afn ag- aga agb agc age agf agg agk agl agn aka akb akc ake akg akk akl akn al- ala alb alc ale alf alg alk all aln an- ana anb anc ane anf ang ank anl ann baa bab bac bae baf bag bak bal ban bba bbb bbc bbe bbf bbg bbk bbl bbn bca bcb bcc bce bcf bcg bck bcl bcn be- bea beb bec bee bef beg bek bel ben bfa bfb bfc bfe bff bfg bfl bfn bga bgb bgc bge bgf bgg bgk bgl bgn bka bkb bkc bke bkf bkg bkk bkl bkn bla blb blc ble blf blg blk bll bln bna bnb bnc bne bnf bng bnk bnl bnn c-- caa cab cac cae caf cag cak cal can cba cbb cbc cbe cbf cbg cbk cbl cbn cca ccb ccc cce ccf ccg cck ccl ccn ce- cea ceb cec cee cef ceg cek cel cen cfa cfb cfc cfe cff cfg cfk cfl cfn cga cgb cgc cge cgg cgl cgn cka ckb ckc cl- cla clb clc cle clf clg clk cll cln cn- cna cnb cnc cne cnf cng cnl cnn eaa eab eac eae eaf eag eak eal ean eba ebb ebc ebe ebf ebg ebk ebl ebn ec- eca ecb ecc ece ecf ecg eck ecl ecn eea eeb eec eee eef eeg eek eel een ef- efa efb efc efe eff efg efl ega egb egc ege egf egg egl egn eka ekb ekc eke ekf ekg ekl ela elb elc ele elf elg elk ell eln en- ena enb enc ene enf eng enk enl enn faa fab fac fae faf fag fak fal fan fba fbb fbc fbe fbf fbg fbk fbl fbn fca fcb fcc fce fcf fcg fck fcl fcn fea feb fec fee fef feg fek fel fen ffa ffc ffe fff ffg ffk ffl ffn fga fgb fgc fge fgf fgg fgl fgn fka fkb fkc fkf fkg fkk fkl fla flb flc fle flf flg fll fln fna fnb fnc fne fnf fng fnk fnl fnn gaa gab gac gae gaf gag gak gal gan gba gbc gbe gbf gbg gbk gbl gbn gca gcb gcc gce gcf gcg gck gcl gcn ge- gea geb gec gee gef geg gek gel gen gfa gfb gfc gfe gff gfk gfl gga ggb ggc ggg ggn gka gkb gkn gla glb glc gle glf glg glk gll gln gna gnb gnc gne gnf gnl gnn ka- kaa kab kac kae kaf kag kak kal kan kba kbb kbc kbe kbf kbk kbl kbn kca kcb kcc kce kcg kck kcl kcn ke- kea keb kec kee kef keg kek kel ken kfa kfc kff kfg kga kgb kgc kgf kgl kkb kkc kke kkk kkl kkn kl- kla klb klc klf klg kn- kna knc kne knf kng knk knl knn la- laa lab lac lae laf lag lak lal lan lba lbb lbc lbe lbf lbg lbk lbl lca lcb lcc lce lcf lcg lck lcl lcn lea leb lec lee lef leg lek lel len lfa lfb lfc lfe lff lfg lfk lfl lfn lga lgb lgc lge lgf lgg lgk lgl lgn lka lkb lkg lkl lla llb llc lle llf llg llk lll lln lna lnb lnc lne lng lnk lnl lnn naa nab nac nae naf nag nak nal nan nba nbb nbc nbe nbf nbg nbk nbl nbn nca ncb ncc nce ncf ncg nck ncl ncn ne- nea neb nec nee nef neg nek nel nen nfa nfb nfc nfe nff nfk nfl nfn nga ngb ngc nge ngf ngg ngk ngl ngn nka nkc nke nkf nkk nkn nla nlb nlc nle nlf nlg nlk nll nln nna nnb nnc nne nnf nng nnk nnl nnn