a-a a-b a-i aaa aab aad aae aai aao ab- aba abb abd abe abi abo ad- ada adb add ade adi ado aea aeb aed aee aei aeo ai- aia aib aid aie aii aio aoa aob aod aoe aoi aoo baa bab bad bae bai bao bba bbb bbd bbe bbi bbo bda bdb bdd bde bdi bdo be- bea beb bed bee bei beo bi- bia bib bid bie bii bio boa bob bod boe boi boo daa dab dad dae dai dao dba dbb dbd dbe dbi dbo dda ddb ddd dde ddi ddo de- dea deb ded dee dei deo di- dia dib did die dii dio doa dob dod doe doi doo eaa eab ead eae eai eao eba ebb ebd ebe ebi ebo ed- eda edb edd ede edi edo eea eeb eed eee eeo eia eib eid eie eii eio eo- eoa eob eod eoe eoi eoo i-d ia- iaa iab iad iae iai iao iba ibb ibd ibe ibi ibo ida idb idd ide idi ido ie- iea ied iee iei iia iib iid iie iii iio io- ioa iob iod ioe ioi ioo o-i oaa oab oad oae oai oao ob- oba obb obd obe obi obo oda odb odd ode odi odo oea oeb oed oee oei oeo oia oib oid oie oii oio oo- ooa oob ood ooi ooo