-er a-a a-i aaa aae aai aar aas aax aea aee aei aer aes aex ai- aia aie aii air ais aix ar- ara are ari arr ars arx as- asa ase asi asr ass asx ax- axa axe axi axr axs axx eaa eae eai ear eas eax eea eee eer ees eex eia eie eii eir eis eix era ere eri err ers es- esa ese esi esr ess esx ex- exa exe exi exr exs exx ia- iaa iae iai iar ias ie- iea iee iei ier ies iex iia iie iii iir iis iix ir- ira ire iri irr irs irx is- isa ise isi isr iss ixe ixi ra- raa rae rai rar ras rax re- rea ree rei rer res rex ria rie rii rir ris rix rra rri rrr rrs rsa rse rsi rsr rss rsx rxr rxs saa sae sai sar sas sax se- sea see sei ser ses sex sia sie sii sir sis six sr- sra sre sri srr srs srx ss- ssa sse ssi ssr sss ssx sxi sxs xaa xar xas xee xer xes xex xia xie xii xis xix xrx xsa xsi xss xxi xxx