a-a a-b a-i a-t aaa aab aad aae aai aak aao aat ab- aba abb abd abe abi abk abo abt ad- ada adb add ade adi adk ado adt aea aeb aed aee aei aek aeo aet ai- aia aib aid aie aii aik aio ait aka akb akd ake aki akk ako aoa aob aod aoe aoi aok aoo aot at- ata atb atd ate ati ato att baa bab bad bae bai bak bao bat bba bbb bbd bbe bbi bbk bbo bbt bda bdb bdd bde bdi bdk bdo bdt be- bea beb bed bee bei bek beo bet bi- bia bib bid bie bii bik bio bit bka bkb bke bkk bko bkt boa bob bod boe boi bok boo bot bta btb btd bte bti btk bto btt daa dab dad dae dai dak dao dat dba dbb dbd dbe dbi dbk dbo dbt dda ddb ddd dde ddi ddk ddo ddt de- dea deb ded dee dei dek deo det di- dia dib did die dii dik dio dit dka dkb dke dki dkk dko dkt doa dob dod doe doi dok doo dot dta dtb dtd dte dti dtk dto dtt eaa eab ead eae eai eak eao eat eba ebb ebd ebe ebi ebk ebo ebt ed- eda edb edd ede edi edk edo edt eea eeb eed eee eek eeo eet eia eib eid eie eii eik eio eit eka ekb ekd eke eki eko ekt eo- eoa eob eod eoe eoi eok eoo eot eta etb etd ete eti etk eto ett i-d ia- iaa iab iad iae iai iao iat iba ibb ibd ibe ibi ibk ibo ibt ida idb idd ide idi idk ido idt ie- iea ied iee iei iek iet iia iib iid iie iii iio iit ika ikb ike iki ikk iko ikt io- ioa iob iod ioe ioi ioo iot ita itb itd ite iti itk ito itt k-t ka- kaa kab kad kae kai kak kao kat kba kbb kbd kbe kbi kbk kbo kda kdb kde kdk kdo kdt ke- kea keb ked kee kei kek keo ket kia kib kid kie kii kik kio kit kkb kke kki kkk kkt koa kob kod koe koi kok koo kot kta ktb kte ktk kto ktt o-i oaa oab oad oae oai oak oao oat ob- oba obb obd obe obi obk obo obt oda odb odd ode odi odo odt oea oeb oed oee oei oeo oet oia oib oid oie oii oik oio oit oka okb okd oke oki okk oko oo- ooa oob ood ooi ook ooo oot ot- ota otb otd ote oti otk oto ott taa tab tad tae tai tak tao tat tba tbb tbd tbe tbi tbk tbo tbt tda tdb tdd tde tdi tdk tdo tdt te- tea teb ted tee tei tek teo tet tia tib tid tie tii tik tio tit tka tkb tke tkk tko tkt to- toa tob tod toe toi tok too tot tta ttb ttd tte tti ttk tto ttt