-er a-a aaa aae aan aao aar aax aea aee aen aeo aer aex an- ana ane ann ano anr anx aoa aoe aon aoo aor aox ar- ara are arn aro arr arx ax- axa axe axn axo axr axx eaa eae ean eao ear eax eea eee een eeo eer eex en- ena ene enn eno enr eo- eoa eoe eon eoo eor era ere ern ero err ex- exa exe exo exr exx naa nae nan nao nar nax ne- nea nee nen neo ner nex nna nne nnn nno no- noa noe non noo nor nox nra nre nrn nro nrr nrx oaa oae oan oao oar oax oea oee oen oeo oer oex on- ona one onn ono onr onx oo- ooa oon ooo oor oox or- ora ore orn oro orr orx ox- oxa oxn oxo oxx ra- raa rae ran rao rar rax re- rea ree ren reo rer rex rna rnn rno rnr roa roe ron roo ror rox rra rrn rrr rxr xaa xan xar xee xen xer xex xna xno xoa xon xoo xor xox xrx xxo xxx