a-a a-b a-i a-z aaa aab aai aak aaz ab- aba abb abi abk abz ai- aia aib aii aik aiz aka akb aki akk az- aza azb azi azz baa bab bai bak baz bba bbb bbi bbk bi- bia bib bii bik biz bka bkb bkk bza bzz ia- iaa iab iai iaz iba ibb ibi ibk ibz iia iib iii ika ikb iki ikk iza izi izz k-z ka- kaa kab kai kak kaz kba kbb kbi kbk kbz kia kib kii kik kiz kkb kki kkk zaa zab zai zak zaz zbb zia zib zik ziz zka zzz