a-a a-b a-i a-z aaa aab aae aai aak aaz ab- aba abb abe abi abk abz aea aeb aee aei aek aez ai- aia aib aie aii aik aiz aka akb ake aki akk az- aza azb aze azi azz baa bab bae bai bak baz bba bbb bbe bbi bbk be- bea beb bee bei bek bez bi- bia bib bie bii bik biz bka bkb bke bkk bza bze bzz eaa eab eae eai eak eaz eba ebb ebe ebi ebk eea eeb eee eek eia eib eie eii eik eka ekb eke eki eze ezz ia- iaa iab iae iai iaz iba ibb ibe ibi ibk ibz ie- iea iee iei iek iia iib iie iii ika ikb ike iki ikk iza ize izi izz k-z ka- kaa kab kae kai kak kaz kba kbb kbe kbi kbk kbz ke- kea keb kee kei kek kez kia kib kie kii kik kiz kkb kke kki kkk zaa zab zai zak zaz zbb zea zeb zee zek zez zia zib zie zik ziz zka zzz