a-a a-b a-t aaa aab aad aae aao aat ab- aba abb abd abe abo abt ad- ada adb add ade ado adt aea aeb aed aee aeo aet aoa aob aod aoe aoo aot at- ata atb atd ate ato att baa bab bad bae bao bat bba bbb bbd bbe bbo bbt bda bdb bdd bde bdo bdt be- bea beb bed bee beo bet boa bob bod boe boo bot bta btb btd bte bto btt daa dab dad dae dao dat dba dbb dbd dbe dbo dbt dda ddb ddd dde ddo ddt de- dea deb ded dee deo det doa dob dod doe doo dot dta dtb dtd dte dto dtt eaa eab ead eae eao eat eba ebb ebd ebe ebo ebt ed- eda edb edd ede edo edt eea eeb eed eee eeo eet eo- eoa eob eod eoe eoo eot eta etb etd ete eto ett oaa oab oad oae oao oat ob- oba obb obd obe obo obt oda odb odd ode odo odt oea oeb oed oee oeo oet oo- ooa oob ood ooo oot ot- ota otb otd ote oto ott taa tab tad tae tao tat tba tbb tbd tbe tbo tbt tda tdb tdd tde tdo tdt te- tea teb ted tee teo tet to- toa tob tod toe too tot tta ttb ttd tte tto ttt