a-a a-b a-i a-z aaa aab aai aan aaz ab- aba abb abi abn abz ai- aia aib aii ain aiz an- ana anb ani ann anz az- aza azb azi azn azz baa bab bai ban baz bba bbb bbi bbn bi- bia bib bii bin biz bna bnb bni bnn bnz bza bzn bzz ia- iaa iab iai ian iaz iba ibb ibi ibn ibz iia iib iii iin in- ina inb ini inn iza izi izz n-i naa nab nai nan naz nba nbb nbi nbn nia nib nii nin niz nna nnb nni nnn nnz nzb nzi nzz zaa zab zai zan zaz zbb zia zib zin ziz znn zzz