-al a-a a-b a-t aaa aab aag aal aas aat ab- aba abb abg abl abs abt ag- aga agb agg agl ags agt al- ala alb alg all als alt as- asa asb asg asl ass ast at- ata atb atg atl ats att baa bab bag bal bas bat bba bbb bbg bbl bbs bbt bga bgb bgg bgl bgs bgt bla blb blg bll bls blt bsa bsb bsg bsl bss bst bta btb btg btl bts btt gaa gab gag gal gas gat gba gbg gbl gbs gbt gga ggb ggg ggs ggt gla glb glg gll gls glt gsa gsb gsg gsl gss gst gta gtb gtg gtl gts gtt la- laa lab lag lal las lat lba lbb lbg lbl lbs lbt lga lgb lgg lgl lgs lgt lla llb llg lll lls llt lsa lsb lsg lsl lss lst lta ltb ltg ltl lts ltt saa sab sag sal sas sat sba sbb sbg sbl sbs sbt sga sgb sgg sgl sgs sgt sla slb slg sll sls slt ss- ssa ssb ssg ssl sss sst sta stb stg stl sts stt taa tab tag tal tas tat tba tbb tbg tbl tbs tbt tga tgb tgg tgl tgs tgt tla tlg tll tls tlt tsa tsb tsg tsl tss tst tta ttb ttg ttl tts ttt