a-a a-b a-i aaa aab aad aai aak aan aao ab- aba abb abd abi abk abn abo ad- ada adb add adi adk adn ado ai- aia aib aid aii aik ain aio aka akb akd aki akk akn ako an- ana anb and ani ank ann ano aoa aob aod aoi aok aon aoo baa bab bad bai bak ban bao bba bbb bbd bbi bbk bbn bbo bda bdb bdd bdi bdk bdo bi- bia bib bid bii bik bin bio bka bkb bkk bkn bko bna bnb bnd bni bnk bnn bno boa bob bod boi bok bon boo daa dab dad dai dak dan dao dba dbb dbd dbi dbk dbn dbo dda ddb ddd ddi ddk ddn ddo di- dia dib did dii dik din dio dka dkb dki dkk dko dna dnb dnd dni dnk dnn dno doa dob dod doi dok don doo i-d ia- iaa iab iad iai ian iao iba ibb ibd ibi ibk ibn ibo ida idb idd idi idk idn ido iia iib iid iii iin iio ika ikb iki ikk iko in- ina inb ind ini ink inn ino io- ioa iob iod ioi ion ioo ka- kaa kab kad kai kak kan kao kba kbb kbd kbi kbk kbn kbo kda kdb kdk kdo kia kib kid kii kik kin kio kkb kki kkk kkn kn- kna knd kni knk knn kno koa kob kod koi kok kon koo n-i naa nab nad nai nak nan nao nba nbb nbd nbi nbk nbn nbo nda ndb ndd ndi ndk ndn ndo nia nib nid nii nik nin nio nka nki nkk nkn nko nna nnb nni nnk nnn nno no- noa nob nod noi nok non noo o-i oaa oab oad oai oak oan oao ob- oba obb obd obi obk obn obo oda odb odd odi odn odo oia oib oid oii oik oin oio oka okb okd oki okk oko on- ona onb ond oni onk onn ono oo- ooa oob ood ooi ook oon ooo