-er a-a a-i aaa aae aaf aag aai aar aas aax aea aee aef aeg aei aer aes aex af- afa afe aff afg afi afr afs afx ag- aga age agf agg agi agr ags agx ai- aia aie aif aig aii air ais aix ar- ara are arf arg ari arr ars arx as- asa ase asf asg asi asr ass asx ax- axa axe axi axr axs axx eaa eae eaf eag eai ear eas eax eea eee eef eeg eer ees eex ef- efa efe eff efg efi efr efs efx ega ege egf egg egi egr egs egx eia eie eif eig eii eir eis eix era ere erf erg eri err ers es- esa ese esf esg esi esr ess esx ex- exa exe exi exr exs exx faa fae faf fag fai far fas fax fea fee fef feg fei fer fes fex ffa ffe fff ffg ffi ffr ffs ffx fga fge fgf fgg fgi fgr fgs fia fie fif fig fii fir fis fix fra fre frf frg fri frr frs fsa fse fsf fsg fsi fsr fss fsx fxe fxg fxi fxr fxs fxx gaa gae gaf gag gai gar gas ge- gea gee gef geg gei ger ges gex gfa gfe gff gfi gfr gfs gfx gga ggg ggi ggr ggs gia gie gif gig gii gir gis gra gre grf grg gri grr grs grx gsa gse gsf gsg gsi gsr gss gsx gxa gxf gxs i-f ia- iaa iae iaf iag iai iar ias ie- iea iee ief ieg iei ier ies iex ifa ife iff ifg ifi ifr ifs ifx iga ige igf igg igi igr igs iia iie iif iii iir iis iix ir- ira ire irf irg iri irr irs irx is- isa ise isf isg isi isr iss ixe ixi ra- raa rae raf rag rai rar ras rax re- rea ree ref reg rei rer res rex rfa rfe rff rfg rfi rfr rfs rga rge rgf rgg rgi rgr rgs rgx ria rie rif rig rii rir ris rix rra rrf rrg rri rrr rrs rsa rse rsf rsg rsi rsr rss rsx rxr rxs saa sae saf sag sai sar sas sax se- sea see sef seg sei ser ses sex sfa sfe sff sfg sfi sfr sfs sfx sga sge sgf sgg sgi sgr sgs sgx sia sie sif sig sii sir sis six sr- sra sre srf srg sri srr srs srx ss- ssa sse ssf ssg ssi ssr sss ssx sxi sxs xaa xaf xag xar xas xee xeg xer xes xex xfa xfe xfs xfx xge xgi xia xie xii xis xix xrf xrx xsa xsi xss xxi xxx