a-a a-b a-i aaa aab aai aak aan ab- aba abb abi abk abn ai- aia aib aii aik ain aka akb aki akk akn an- ana anb ani ank ann baa bab bai bak ban bba bbb bbi bbk bbn bi- bia bib bii bik bin bka bkb bkk bkn bna bnb bni bnk bnn ia- iaa iab iai ian iba ibb ibi ibk ibn iia iib iii iin ika ikb iki ikk in- ina inb ini ink inn ka- kaa kab kai kak kan kba kbb kbi kbk kbn kia kib kii kik kin kkb kki kkk kkn kn- kna kni knk knn n-i naa nab nai nak nan nba nbb nbi nbk nbn nia nib nii nik nin nka nki nkk nkn nna nnb nni nnk nnn