a-a a-b a-i a-t aaa aab aad aai aak aao aat ab- aba abb abd abi abk abo abt ad- ada adb add adi adk ado adt ai- aia aib aid aii aik aio ait aka akb akd aki akk ako aoa aob aod aoi aok aoo aot at- ata atb atd ati ato att baa bab bad bai bak bao bat bba bbb bbd bbi bbk bbo bbt bda bdb bdd bdi bdk bdo bdt bi- bia bib bid bii bik bio bit bka bkb bkk bko bkt boa bob bod boi bok boo bot bta btb btd bti btk bto btt daa dab dad dai dak dao dat dba dbb dbd dbi dbk dbo dbt dda ddb ddd ddi ddk ddo ddt di- dia dib did dii dik dio dit dka dkb dki dkk dko dkt doa dob dod doi dok doo dot dta dtb dtd dti dtk dto dtt i-d ia- iaa iab iad iai iao iat iba ibb ibd ibi ibk ibo ibt ida idb idd idi idk ido idt iia iib iid iii iio iit ika ikb iki ikk iko ikt io- ioa iob iod ioi ioo iot ita itb itd iti itk ito itt k-t ka- kaa kab kad kai kak kao kat kba kbb kbd kbi kbk kbo kda kdb kdk kdo kdt kia kib kid kii kik kio kit kkb kki kkk kkt koa kob kod koi kok koo kot kta ktb ktk kto ktt o-i oaa oab oad oai oak oao oat ob- oba obb obd obi obk obo obt oda odb odd odi odo odt oia oib oid oii oik oio oit oka okb okd oki okk oko oo- ooa oob ood ooi ook ooo oot ot- ota otb otd oti otk oto ott taa tab tad tai tak tao tat tba tbb tbd tbi tbk tbo tbt tda tdb tdd tdi tdk tdo tdt tia tib tid tii tik tio tit tka tkb tkk tko tkt to- toa tob tod toi tok too tot tta ttb ttd tti ttk tto ttt