a-a a-b a-t aaa aab aad aae aan aao aat ab- aba abb abd abe abn abo abt ad- ada adb add ade adn ado adt aea aeb aed aee aen aeo aet an- ana anb and ane ann ano ant aoa aob aod aoe aon aoo aot at- ata atb atd ate atn ato att baa bab bad bae ban bao bat bba bbb bbd bbe bbn bbo bbt bda bdb bdd bde bdo bdt be- bea beb bed bee ben beo bet bna bnb bnd bne bnn bno bnt boa bob bod boe bon boo bot bta btb btd bte btn bto btt daa dab dad dae dan dao dat dba dbb dbd dbe dbn dbo dbt dda ddb ddd dde ddn ddo ddt de- dea deb ded dee den deo det dna dnb dnd dne dnn dno dnt doa dob dod doe don doo dot dta dtb dtd dte dtn dto dtt eaa eab ead eae ean eao eat eba ebb ebd ebe ebn ebo ebt ed- eda edb edd ede edn edo edt eea eeb eed eee een eeo eet en- ena enb end ene enn eno ent eo- eoa eob eod eoe eon eoo eot eta etb etd ete etn eto ett naa nab nad nae nan nao nat nba nbb nbd nbe nbn nbo nbt nda ndb ndd nde ndn ndo ndt ne- nea neb ned nee nen neo net nna nnb nne nnn nno nnt no- noa nob nod noe non noo not nta ntb ntd nte ntn nto ntt oaa oab oad oae oan oao oat ob- oba obb obd obe obn obo obt oda odb odd ode odn odo odt oea oeb oed oee oen oeo oet on- ona onb ond one onn ono ont oo- ooa oob ood oon ooo oot ot- ota otb otd ote otn oto ott taa tab tad tae tan tao tat tba tbb tbd tbe tbn tbo tbt tda tdb tdd tde tdn tdo tdt te- tea teb ted tee ten teo tet tna tnb tnd tne tnn tno tnt to- toa tob tod toe ton too tot tta ttb ttd tte ttn tto ttt