a-a a-b a-t aaa aab aad aan aao aat aau ab- aba abb abd abn abo abt abu ad- ada adb add adn ado adt adu an- ana anb and ann ano ant anu aoa aob aod aon aoo aot aou at- ata atb atd atn ato att atu au- aua aub aud aun auo aut b-u baa bab bad ban bao bat bau bba bbb bbd bbn bbo bbt bbu bda bdb bdd bdo bdt bdu bna bnb bnd bnn bno bnt bnu boa bob bod bon boo bot bou bta btb btd btn bto btt btu bua bub bud bun buo but buu daa dab dad dan dao dat dau dba dbb dbd dbn dbo dbt dbu dda ddb ddd ddn ddo ddt ddu dna dnb dnd dnn dno dnt doa dob dod don doo dot dou dta dtb dtd dtn dto dtt dtu dua dub dud dun duo dut naa nab nad nan nao nat nau nba nbb nbd nbn nbo nbt nbu nda ndb ndd ndn ndo ndt ndu nna nnb nnn nno nnt nnu no- noa nob nod non noo not nou nta ntb ntd ntn nto ntt ntu nua nub nud nun nuo nut nuu oaa oab oad oan oao oat oau ob- oba obb obd obn obo obt obu oda odb odd odn odo odt odu on- ona onb ond onn ono ont onu oo- ooa oob ood oon ooo oot ot- ota otb otd otn oto ott otu ou- oua oud oun ouo out taa tab tad tan tao tat tau tba tbb tbd tbn tbo tbt tbu tda tdb tdd tdn tdo tdt tdu tna tnb tnd tnn tno tnt to- toa tob tod ton too tot tou tta ttb ttd ttn tto ttt ttu tua tub tud tun tuo tut tuu ua- uaa uab uad uan uao uat uau uba ubb ubn ubo ubt ubu uda udb udd udn udo udt udu un- una unb und unn uno unt unu uoa uob uod uon uoo uot uta utb utd utn uto utt utu uua uun uut uuu