a-a a-b a-t aaa aab aad aag aan aat ab- aba abb abd abg abn abt ad- ada adb add adg adn adt ag- aga agb agd agg agn agt an- ana anb and ang ann ant at- ata atb atd atg atn att baa bab bad bag ban bat bba bbb bbd bbg bbn bbt bda bdb bdd bdg bdt bga bgb bgd bgg bgn bgt bna bnb bnd bng bnn bnt bta btb btd btg btn btt daa dab dad dag dan dat dba dbb dbd dbg dbn dbt dda ddb ddd ddg ddn ddt dga dgd dgg dgn dgt dna dnb dnd dng dnn dnt dta dtb dtd dtg dtn dtt g-d gaa gab gad gag gan gat gba gbd gbg gbn gbt gda gdb gdd gdn gdt gga ggb ggd ggg ggn ggt gna gnb gnd gnn gnt gta gtb gtd gtg gtn gtt naa nab nad nag nan nat nba nbb nbd nbg nbn nbt nda ndb ndd ndg ndn ndt nga ngb ngd ngg ngn ngt nna nnb nng nnn nnt nta ntb ntd ntg ntn ntt taa tab tad tag tan tat tba tbb tbd tbg tbn tbt tda tdb tdd tdg tdn tdt tga tgb tgg tgn tgt tna tnb tnd tng tnn tnt tta ttb ttd ttg ttn ttt