a-a a-b a-i aaa aab aad aae aai aak aan ab- aba abb abd abe abi abk abn ad- ada adb add ade adi adk adn aea aeb aed aee aei aek aen ai- aia aib aid aie aii aik ain aka akb akd ake aki akk akn an- ana anb and ane ani ank ann baa bab bad bae bai bak ban bba bbb bbd bbe bbi bbk bbn bda bdb bdd bde bdi bdk be- bea beb bed bee bei bek ben bi- bia bib bid bie bii bik bin bka bkb bke bkk bkn bna bnb bnd bne bni bnk bnn daa dab dad dae dai dak dan dba dbb dbd dbe dbi dbk dbn dda ddb ddd dde ddi ddk ddn de- dea deb ded dee dei dek den di- dia dib did die dii dik din dka dkb dke dki dkk dna dnb dnd dne dni dnk dnn eaa eab ead eae eai eak ean eba ebb ebd ebe ebi ebk ebn ed- eda edb edd ede edi edk edn eea eeb eed eee eek een eia eib eid eie eii eik ein eka ekb ekd eke eki en- ena enb end ene eni enk enn i-d ia- iaa iab iad iae iai ian iba ibb ibd ibe ibi ibk ibn ida idb idd ide idi idk idn ie- iea ied iee iei iek ien iia iib iid iie iii iin ika ikb ike iki ikk in- ina inb ind ine ini ink inn ka- kaa kab kad kae kai kak kan kba kbb kbd kbe kbi kbk kbn kda kdb kde kdk ke- kea keb ked kee kei kek ken kia kib kid kie kii kik kin kkb kke kki kkk kkn kn- kna knd kne kni knk knn n-i naa nab nad nae nai nak nan nba nbb nbd nbe nbi nbk nbn nda ndb ndd nde ndi ndk ndn ne- nea neb ned nee nei nek nen nia nib nid nie nii nik nin nka nke nki nkk nkn nna nnb nne nni nnk nnn