-er a-a a-i aaa aae aaf aai aao aar aas aax aea aee aef aei aeo aer aes aex af- afa afe aff afi afo afr afs afx ai- aia aie aif aii aio air ais aix aoa aoe aof aoi aoo aor aos aox ar- ara are arf ari aro arr ars arx as- asa ase asf asi aso asr ass asx ax- axa axe axi axo axr axs axx eaa eae eaf eai eao ear eas eax eea eee eef eeo eer ees eex ef- efa efe eff efi efo efr efs efx eia eie eif eii eio eir eis eix eo- eoa eoe eof eoi eoo eor eos era ere erf eri ero err ers es- esa ese esf esi eso esr ess esx ex- exa exe exi exo exr exs exx faa fae faf fai fao far fas fax fea fee fef fei feo fer fes fex ffa ffe fff ffi ffo ffr ffs ffx fia fie fif fii fir fis fix foa foe fof foi foo for fos fox fra fre frf fri fro frr frs fsa fse fsf fsi fso fsr fss fsx fxe fxi fxr fxs fxx i-f ia- iaa iae iaf iai iao iar ias ie- iea iee ief iei ier ies iex ifa ife iff ifi ifo ifr ifs ifx iia iie iif iii iio iir iis iix io- ioa ioe iof ioi ioo ior ios ir- ira ire irf iri iro irr irs irx is- isa ise isf isi iso isr iss ixe ixi o-i oaa oae oaf oai oao oar oas oax oea oee oef oei oeo oer oes oex of- ofa ofe off ofi ofo ofr ofs ofx oia oie oif oii oio oir ois oo- ooa oof ooi ooo oor oos oox or- ora ore orf ori oro orr ors orx os- osa ose osf osi oso osr oss osx ox- oxa oxf oxi oxo oxx ra- raa rae raf rai rao rar ras rax re- rea ree ref rei reo rer res rex rfa rfe rff rfi rfo rfr rfs ria rie rif rii rio rir ris rix roa roe rof roi roo ror ros rox rra rrf rri rrr rrs rsa rse rsf rsi rso rsr rss rsx rxr rxs saa sae saf sai sao sar sas sax se- sea see sef sei seo ser ses sex sfa sfe sff sfi sfo sfr sfs sfx sia sie sif sii sio sir sis six soa soe sof soi soo sor sos sox sr- sra sre srf sri sro srr srs srx ss- ssa sse ssf ssi sso ssr sss ssx sxi sxs xaa xaf xar xas xee xer xes xex xfa xfe xfs xfx xia xie xii xio xis xix xoa xof xoi xoo xor xos xox xrf xrx xsa xsi xss xxi xxo xxx