a-a a-b a-t a-z aaa aab aan aao aat aau aaz ab- aba abb abn abo abt abu abz an- ana anb ann ano ant anu anz aoa aob aon aoo aot aou at- ata atb atn ato att atu atz au- aua aub aun auo aut auz az- aza azb azn azo azt azu azz b-u baa bab ban bao bat bau baz bba bbb bbn bbo bbt bbu bna bnb bnn bno bnt bnu bnz boa bob bon boo bot bou boz bta btb btn bto btt btu btz bua bub bun buo but buu buz bza bzn bzo bzu bzz naa nab nan nao nat nau naz nba nbb nbn nbo nbt nbu nna nnb nnn nno nnt nnu nnz no- noa nob non noo not nou noz nta ntb ntn nto ntt ntu ntz nua nub nun nuo nut nuu nzb nzo nzz oaa oab oan oao oat oau ob- oba obb obn obo obt obu on- ona onb onn ono ont onu oo- ooa oob oon ooo oot ot- ota otb otn oto ott otu otz ou- oua oun ouo out oza ozo ozt ozu ozz taa tab tan tao tat tau taz tba tbb tbn tbo tbt tbu tbz tna tnb tnn tno tnt tnz to- toa tob ton too tot tou toz tta ttb ttn tto ttt ttu tua tub tun tuo tut tuu tuz tza tzu ua- uaa uab uan uao uat uau uaz uba ubb ubn ubo ubt ubu un- una unb unn uno unt unu uoa uob uon uoo uot uta utb utn uto utt utu utz uua uun uut uuu uza uzb uzo uzu zaa zab zan zao zat zaz zbb zbt znn zno zo- zoa zob zon zoo zot zou zta zub zun zut zuz zzt zzz