-al a-a a-b a-c aaa aab aac aae aaf aag aal ab- aba abb abc abe abf abg abl ac- aca acb acc ace acf acg acl aea aeb aec aee aef aeg ael af- afa afb afc afe aff afg afl ag- aga agb agc age agf agg agl al- ala alb alc ale alf alg all baa bab bac bae baf bag bal bba bbb bbc bbe bbf bbg bbl bca bcb bcc bce bcf bcg bcl be- bea beb bec bee bef beg bel bfa bfb bfc bfe bff bfg bfl bga bgb bgc bge bgf bgg bgl bla blb blc ble blf blg bll c-- caa cab cac cae caf cag cal cba cbb cbc cbe cbf cbg cbl cca ccb ccc cce ccf ccg ccl ce- cea ceb cec cee cef ceg cel cfa cfb cfc cfe cff cfg cfl cga cgb cgc cge cgg cgl cl- cla clb clc cle clf clg cll eaa eab eac eae eaf eag eal eba ebb ebc ebe ebf ebg ebl ec- eca ecb ecc ece ecf ecg ecl eea eeb eec eee eef eeg eel ef- efa efb efc efe eff efg efl ega egb egc ege egf egg egl ela elb elc ele elf elg ell faa fab fac fae faf fag fal fba fbb fbc fbe fbf fbg fbl fca fcb fcc fce fcf fcg fcl fea feb fec fee fef feg fel ffa ffc ffe fff ffg ffl fga fgb fgc fge fgf fgg fgl fla flb flc fle flf flg fll gaa gab gac gae gaf gag gal gba gbc gbe gbf gbg gbl gca gcb gcc gce gcf gcg gcl ge- gea geb gec gee gef geg gel gfa gfb gfc gfe gff gfl gga ggb ggc ggg gla glb glc gle glf glg gll la- laa lab lac lae laf lag lal lba lbb lbc lbe lbf lbg lbl lca lcb lcc lce lcf lcg lcl lea leb lec lee lef leg lel lfa lfb lfc lfe lff lfg lfl lga lgb lgc lge lgf lgg lgl lla llb llc lle llf llg lll