-al a-a a-b aaa aab aae aaf aag aal aan ab- aba abb abe abf abg abl abn aea aeb aee aef aeg ael aen af- afa afb afe aff afg afl afn ag- aga agb age agf agg agl agn al- ala alb ale alf alg all aln an- ana anb ane anf ang anl ann baa bab bae baf bag bal ban bba bbb bbe bbf bbg bbl bbn be- bea beb bee bef beg bel ben bfa bfb bfe bff bfg bfl bfn bga bgb bge bgf bgg bgl bgn bla blb ble blf blg bll bln bna bnb bne bnf bng bnl bnn eaa eab eae eaf eag eal ean eba ebb ebe ebf ebg ebl ebn eea eeb eee eef eeg eel een ef- efa efb efe eff efg efl ega egb ege egf egg egl egn ela elb ele elf elg ell eln en- ena enb ene enf eng enl enn faa fab fae faf fag fal fan fba fbb fbe fbf fbg fbl fbn fea feb fee fef feg fel fen ffa ffe fff ffg ffl ffn fga fgb fge fgf fgg fgl fgn fla flb fle flf flg fll fln fna fnb fne fnf fng fnl fnn gaa gab gae gaf gag gal gan gba gbe gbf gbg gbl gbn ge- gea geb gee gef geg gel gen gfa gfb gfe gff gfl gga ggb ggg ggn gla glb gle glf glg gll gln gna gnb gne gnf gnl gnn la- laa lab lae laf lag lal lan lba lbb lbe lbf lbg lbl lea leb lee lef leg lel len lfa lfb lfe lff lfg lfl lfn lga lgb lge lgf lgg lgl lgn lla llb lle llf llg lll lln lna lnb lne lng lnl lnn naa nab nae naf nag nal nan nba nbb nbe nbf nbg nbl nbn ne- nea neb nee nef neg nel nen nfa nfb nfe nff nfl nfn nga ngb nge ngf ngg ngl ngn nla nlb nle nlf nlg nll nln nna nnb nne nnf nng nnl nnn