a-a a-b a-i aaa aab aad aae aai ab- aba abb abd abe abi ad- ada adb add ade adi aea aeb aed aee aei ai- aia aib aid aie aii baa bab bad bae bai bba bbb bbd bbe bbi bda bdb bdd bde bdi be- bea beb bed bee bei bi- bia bib bid bie bii daa dab dad dae dai dba dbb dbd dbe dbi dda ddb ddd dde ddi de- dea deb ded dee dei di- dia dib did die dii eaa eab ead eae eai eba ebb ebd ebe ebi ed- eda edb edd ede edi eea eeb eed eee eia eib eid eie eii i-d ia- iaa iab iad iae iai iba ibb ibd ibe ibi ida idb idd ide idi ie- iea ied iee iei iia iib iid iie iii