a-a a-b a-t a-z aaa aab aan aat aau aaz ab- aba abb abn abt abu abz an- ana anb ann ant anu anz at- ata atb atn att atu atz au- aua aub aun aut auz az- aza azb azn azt azu azz b-u baa bab ban bat bau baz bba bbb bbn bbt bbu bna bnb bnn bnt bnu bnz bta btb btn btt btu btz bua bub bun but buu buz bza bzn bzu bzz naa nab nan nat nau naz nba nbb nbn nbt nbu nna nnb nnn nnt nnu nnz nta ntb ntn ntt ntu ntz nua nub nun nut nuu nzb nzz taa tab tan tat tau taz tba tbb tbn tbt tbu tbz tna tnb tnn tnt tnz tta ttb ttn ttt ttu tua tub tun tut tuu tuz tza tzu ua- uaa uab uan uat uau uaz uba ubb ubn ubt ubu un- una unb unn unt unu uta utb utn utt utu utz uua uun uut uuu uza uzb uzu zaa zab zan zat zaz zbb zbt znn zta zub zun zut zuz zzt zzz