-er a-a a-i aaa aae aai aao aap aar aas aax aea aee aei aeo aep aer aes aex ai- aia aie aii aio aip air ais aix aoa aoe aoi aoo aop aor aos aox ap- apa ape api apo app apr aps apx ar- ara are ari aro arp arr ars arx as- asa ase asi aso asp asr ass asx ax- axa axe axi axo axp axr axs axx eaa eae eai eao eap ear eas eax eea eee eeo eep eer ees eex eia eie eii eio eip eir eis eix eo- eoa eoe eoi eoo eop eor eos ep- epa epe epi epo epp epr eps epx era ere eri ero erp err ers es- esa ese esi eso esp esr ess esx ex- exa exe exi exo exp exr exs exx ia- iaa iae iai iao iap iar ias ie- iea iee iei iep ier ies iex iia iie iii iio iip iir iis iix io- ioa ioe ioi ioo iop ior ios ipa ipe ipi ipo ipp ipr ips ipx ir- ira ire iri iro irp irr irs irx is- isa ise isi iso isp isr iss ixe ixi o-i oaa oae oai oao oap oar oas oax oea oee oei oeo oep oer oes oex oia oie oii oio oip oir ois oo- ooa ooi ooo oop oor oos oox op- opa ope opi opo opp opr ops opx or- ora ore ori oro orp orr ors orx os- osa ose osi oso osp osr oss osx ox- oxa oxi oxo oxx p-p paa pae pai pao pap par pas pax pea pee pei peo pep per pes pex pia pie pii pio pip pir pis pix poa poe poi poo pop por pos pox ppa ppe ppi ppo ppp ppr pps ppx pra pre pri pro prp prr prs prx ps- psa pse psi pso psp psr pss psx pxe pxr pxs ra- raa rae rai rao rap rar ras rax re- rea ree rei reo rep rer res rex ria rie rii rio rip rir ris rix roa roe roi roo rop ror ros rox rpa rpe rpi rpo rpp rpr rps rpx rra rri rrp rrr rrs rsa rse rsi rso rsp rsr rss rsx rxp rxr rxs saa sae sai sao sap sar sas sax se- sea see sei seo sep ser ses sex sia sie sii sio sip sir sis six soa soe soi soo sop sor sos sox spa spe spi spo spp spr sps spx sr- sra sre sri sro srp srr srs srx ss- ssa sse ssi sso ssp ssr sss ssx sxi sxs xaa xap xar xas xee xep xer xes xex xia xie xii xio xis xix xoa xoi xoo xop xor xos xox xpa xpe xpo xpp xps xrx xsa xsi xsp xss xxi xxo xxp xxx