-al a-a a-b a-c aaa aab aac aaf aag aak aal ab- aba abb abc abf abg abk abl ac- aca acb acc acf acg ack acl af- afa afb afc aff afg afk afl ag- aga agb agc agf agg agk agl aka akb akc akg akk akl al- ala alb alc alf alg alk all baa bab bac baf bag bak bal bba bbb bbc bbf bbg bbk bbl bca bcb bcc bcf bcg bck bcl bfa bfb bfc bff bfg bfl bga bgb bgc bgf bgg bgk bgl bka bkb bkc bkf bkg bkk bkl bla blb blc blf blg blk bll c-- caa cab cac caf cag cak cal cba cbb cbc cbf cbg cbk cbl cca ccb ccc ccf ccg cck ccl cfa cfb cfc cff cfg cfk cfl cga cgb cgc cgg cgl cka ckb ckc cl- cla clb clc clf clg clk cll faa fab fac faf fag fak fal fba fbb fbc fbf fbg fbk fbl fca fcb fcc fcf fcg fck fcl ffa ffc fff ffg ffk ffl fga fgb fgc fgf fgg fgl fka fkb fkc fkf fkg fkk fkl fla flb flc flf flg fll gaa gab gac gaf gag gak gal gba gbc gbf gbg gbk gbl gca gcb gcc gcf gcg gck gcl gfa gfb gfc gff gfk gfl gga ggb ggc ggg gka gkb gla glb glc glf glg glk gll ka- kaa kab kac kaf kag kak kal kba kbb kbc kbf kbk kbl kca kcb kcc kcg kck kcl kfa kfc kff kfg kga kgb kgc kgf kgl kkb kkc kkk kkl kl- kla klb klc klf klg la- laa lab lac laf lag lak lal lba lbb lbc lbf lbg lbk lbl lca lcb lcc lcf lcg lck lcl lfa lfb lfc lff lfg lfk lfl lga lgb lgc lgf lgg lgk lgl lka lkb lkg lkl lla llb llc llf llg llk lll