a-a a-b a-i aaa aab aad aai aan ab- aba abb abd abi abn ad- ada adb add adi adn ai- aia aib aid aii ain an- ana anb and ani ann baa bab bad bai ban bba bbb bbd bbi bbn bda bdb bdd bdi bi- bia bib bid bii bin bna bnb bnd bni bnn daa dab dad dai dan dba dbb dbd dbi dbn dda ddb ddd ddi ddn di- dia dib did dii din dna dnb dnd dni dnn i-d ia- iaa iab iad iai ian iba ibb ibd ibi ibn ida idb idd idi idn iia iib iid iii iin in- ina inb ind ini inn n-i naa nab nad nai nan nba nbb nbd nbi nbn nda ndb ndd ndi ndn nia nib nid nii nin nna nnb nni nnn