a-a a-b a-i aaa aab aad aai aak ab- aba abb abd abi abk ad- ada adb add adi adk ai- aia aib aid aii aik aka akb akd aki akk baa bab bad bai bak bba bbb bbd bbi bbk bda bdb bdd bdi bdk bi- bia bib bid bii bik bka bkb bkk daa dab dad dai dak dba dbb dbd dbi dbk dda ddb ddd ddi ddk di- dia dib did dii dik dka dkb dki dkk i-d ia- iaa iab iad iai iba ibb ibd ibi ibk ida idb idd idi idk iia iib iid iii ika ikb iki ikk ka- kaa kab kad kai kak kba kbb kbd kbi kbk kda kdb kdk kia kib kid kii kik kkb kki kkk