-al a-a a-b a-t aaa aab aae aag aal aat ab- aba abb abe abg abl abt aea aeb aee aeg ael aet ag- aga agb age agg agl agt al- ala alb ale alg all alt at- ata atb ate atg atl att baa bab bae bag bal bat bba bbb bbe bbg bbl bbt be- bea beb bee beg bel bet bga bgb bge bgg bgl bgt bla blb ble blg bll blt bta btb bte btg btl btt eaa eab eae eag eal eat eba ebb ebe ebg ebl ebt eea eeb eee eeg eel eet ega egb ege egg egl egt ela elb ele elg ell elt eta etb ete etg etl ett gaa gab gae gag gal gat gba gbe gbg gbl gbt ge- gea geb gee geg gel get gga ggb ggg ggt gla glb gle glg gll glt gta gtb gte gtg gtl gtt la- laa lab lae lag lal lat lba lbb lbe lbg lbl lbt lea leb lee leg lel let lga lgb lge lgg lgl lgt lla llb lle llg lll llt lta ltb lte ltg ltl ltt taa tab tae tag tal tat tba tbb tbe tbg tbl tbt te- tea teb tee teg tel tet tga tgb tge tgg tgl tgt tla tle tlg tll tlt tta ttb tte ttg ttl ttt