-al a-a a-b a-t aaa aab aag aal aat ab- aba abb abg abl abt ag- aga agb agg agl agt al- ala alb alg all alt at- ata atb atg atl att baa bab bag bal bat bba bbb bbg bbl bbt bga bgb bgg bgl bgt bla blb blg bll blt bta btb btg btl btt gaa gab gag gal gat gba gbg gbl gbt gga ggb ggg ggt gla glb glg gll glt gta gtb gtg gtl gtt la- laa lab lag lal lat lba lbb lbg lbl lbt lga lgb lgg lgl lgt lla llb llg lll llt lta ltb ltg ltl ltt taa tab tag tal tat tba tbb tbg tbl tbt tga tgb tgg tgl tgt tla tlg tll tlt tta ttb ttg ttl ttt