a-a a-b a-i aaa aab aad aae aai aak aao ab- aba abb abd abe abi abk abo ad- ada adb add ade adi adk ado aea aeb aed aee aei aek aeo ai- aia aib aid aie aii aik aio aka akb akd ake aki akk ako aoa aob aod aoe aoi aok aoo baa bab bad bae bai bak bao bba bbb bbd bbe bbi bbk bbo bda bdb bdd bde bdi bdk bdo be- bea beb bed bee bei bek beo bi- bia bib bid bie bii bik bio bka bkb bke bkk bko boa bob bod boe boi bok boo daa dab dad dae dai dak dao dba dbb dbd dbe dbi dbk dbo dda ddb ddd dde ddi ddk ddo de- dea deb ded dee dei dek deo di- dia dib did die dii dik dio dka dkb dke dki dkk dko doa dob dod doe doi dok doo eaa eab ead eae eai eak eao eba ebb ebd ebe ebi ebk ebo ed- eda edb edd ede edi edk edo eea eeb eed eee eek eeo eia eib eid eie eii eik eio eka ekb ekd eke eki eko eo- eoa eob eod eoe eoi eok eoo i-d ia- iaa iab iad iae iai iao iba ibb ibd ibe ibi ibk ibo ida idb idd ide idi idk ido ie- iea ied iee iei iek iia iib iid iie iii iio ika ikb ike iki ikk iko io- ioa iob iod ioe ioi ioo ka- kaa kab kad kae kai kak kao kba kbb kbd kbe kbi kbk kbo kda kdb kde kdk kdo ke- kea keb ked kee kei kek keo kia kib kid kie kii kik kio kkb kke kki kkk koa kob kod koe koi kok koo o-i oaa oab oad oae oai oak oao ob- oba obb obd obe obi obk obo oda odb odd ode odi odo oea oeb oed oee oei oeo oia oib oid oie oii oik oio oka okb okd oke oki okk oko oo- ooa oob ood ooi ook ooo