-er a-a a-i a-z aaa aae aai aar aax aaz aea aee aei aer aex aez ai- aia aie aii air aix aiz ar- ara are ari arr arx arz ax- axa axe axi axr axx az- aza aze azi azx azz eaa eae eai ear eax eaz eea eee eer eex eia eie eii eir eix era ere eri err erz ex- exa exe exi exr exx eze ezr ezz ia- iaa iae iai iar iaz ie- iea iee iei ier iex iia iie iii iir iix ir- ira ire iri irr irx ixe ixi iza ize izi izz ra- raa rae rai rar rax raz re- rea ree rei rer rex rez ria rie rii rir rix riz rra rri rrr rxr rza rze xaa xar xee xer xex xia xie xii xix xrx xxi xxx zaa zai zar zax zaz zea zee zer zez zia zie zir zix ziz zxx zzr zzx zzz