-al a-a a-b aaa aab aae aag aal aan ab- aba abb abe abg abl abn aea aeb aee aeg ael aen ag- aga agb age agg agl agn al- ala alb ale alg all aln an- ana anb ane ang anl ann baa bab bae bag bal ban bba bbb bbe bbg bbl bbn be- bea beb bee beg bel ben bga bgb bge bgg bgl bgn bla blb ble blg bll bln bna bnb bne bng bnl bnn eaa eab eae eag eal ean eba ebb ebe ebg ebl ebn eea eeb eee eeg eel een ega egb ege egg egl egn ela elb ele elg ell eln en- ena enb ene eng enl enn gaa gab gae gag gal gan gba gbe gbg gbl gbn ge- gea geb gee geg gel gen gga ggb ggg ggn gla glb gle glg gll gln gna gnb gne gnl gnn la- laa lab lae lag lal lan lba lbb lbe lbg lbl lea leb lee leg lel len lga lgb lge lgg lgl lgn lla llb lle llg lll lln lna lnb lne lng lnl lnn naa nab nae nag nal nan nba nbb nbe nbg nbl nbn ne- nea neb nee neg nel nen nga ngb nge ngg ngl ngn nla nlb nle nlg nll nln nna nnb nne nng nnl nnn