a-a a-b a-i aaa aab aad aae aai aan ab- aba abb abd abe abi abn ad- ada adb add ade adi adn aea aeb aed aee aei aen ai- aia aib aid aie aii ain an- ana anb and ane ani ann baa bab bad bae bai ban bba bbb bbd bbe bbi bbn bda bdb bdd bde bdi be- bea beb bed bee bei ben bi- bia bib bid bie bii bin bna bnb bnd bne bni bnn daa dab dad dae dai dan dba dbb dbd dbe dbi dbn dda ddb ddd dde ddi ddn de- dea deb ded dee dei den di- dia dib did die dii din dna dnb dnd dne dni dnn eaa eab ead eae eai ean eba ebb ebd ebe ebi ebn ed- eda edb edd ede edi edn eea eeb eed eee een eia eib eid eie eii ein en- ena enb end ene eni enn i-d ia- iaa iab iad iae iai ian iba ibb ibd ibe ibi ibn ida idb idd ide idi idn ie- iea ied iee iei ien iia iib iid iie iii iin in- ina inb ind ine ini inn n-i naa nab nad nae nai nan nba nbb nbd nbe nbi nbn nda ndb ndd nde ndi ndn ne- nea neb ned nee nei nen nia nib nid nie nii nin nna nnb nne nni nnn