a-a a-b a-t aaa aab aak aan aat ab- aba abb abk abn abt aka akb akk akn an- ana anb ank ann ant at- ata atb atn att baa bab bak ban bat bba bbb bbk bbn bbt bka bkb bkk bkn bkt bna bnb bnk bnn bnt bta btb btk btn btt k-t ka- kaa kab kak kan kat kba kbb kbk kbn kkb kkk kkn kkt kn- kna knk knn knt kta ktb ktk ktn ktt naa nab nak nan nat nba nbb nbk nbn nbt nka nkk nkn nkt nna nnb nnk nnn nnt nta ntb ntk ntn ntt taa tab tak tan tat tba tbb tbk tbn tbt tka tkb tkk tkt tna tnb tnk tnn tnt tta ttb ttk ttn ttt