-er a-a aaa aae aah aao aar aax aea aee aeh aeo aer aex aha ahe ahh aho ahr ahx aoa aoe aoh aoo aor aox ar- ara are arh aro arr arx ax- axa axe axh axo axr axx eaa eae eah eao ear eax eea eee eeo eer eex eha ehe ehh eho ehr eo- eoa eoe eoh eoo eor era ere erh ero err ex- exa exe exh exo exr exx haa hae hah hao har hax he- hea hee heh heo her hex hha hhe hhh hho hhr hoa hoe hoh hoo hor hox hr- hra hre hrh hro hrr oaa oae oah oao oar oax oea oee oeh oeo oer oex oha ohe ohh oho ohr oo- ooa ooh ooo oor oox or- ora ore orh oro orr orx ox- oxa oxo oxx ra- raa rae rah rao rar rax re- rea ree reh reo rer rex rh- rha rhe rhh rho rhr roa roe roh roo ror rox rra rrh rrr rxr xaa xar xee xer xex xoa xoo xor xox xrx xxo xxx