-er a-a a-i aaa aae aaf aai aao aap aar aas aax aea aee aef aei aeo aep aer aes aex af- afa afe aff afi afo afp afr afs afx ai- aia aie aif aii aio aip air ais aix aoa aoe aof aoi aoo aop aor aos aox ap- apa ape apf api apo app apr aps apx ar- ara are arf ari aro arp arr ars arx as- asa ase asf asi aso asp asr ass asx ax- axa axe axi axo axp axr axs axx eaa eae eaf eai eao eap ear eas eax eea eee eef eeo eep eer ees eex ef- efa efe eff efi efo efp efr efs efx eia eie eif eii eio eip eir eis eix eo- eoa eoe eof eoi eoo eop eor eos ep- epa epe epf epi epo epp epr eps epx era ere erf eri ero erp err ers es- esa ese esf esi eso esp esr ess esx ex- exa exe exi exo exp exr exs exx faa fae faf fai fao fap far fas fax fea fee fef fei feo fep fer fes fex ffa ffe fff ffi ffo ffp ffr ffs ffx fia fie fif fii fip fir fis fix foa foe fof foi foo fop for fos fox fpa fpe fpi fpo fpp fpr fps fpx fra fre frf fri fro frp frr frs fsa fse fsf fsi fso fsp fsr fss fsx fxe fxi fxp fxr fxs fxx i-f ia- iaa iae iaf iai iao iap iar ias ie- iea iee ief iei iep ier ies iex ifa ife iff ifi ifo ifp ifr ifs ifx iia iie iif iii iio iip iir iis iix io- ioa ioe iof ioi ioo iop ior ios ipa ipe ipf ipi ipo ipp ipr ips ipx ir- ira ire irf iri iro irp irr irs irx is- isa ise isf isi iso isp isr iss ixe ixi o-i oaa oae oaf oai oao oap oar oas oax oea oee oef oei oeo oep oer oes oex of- ofa ofe off ofi ofo ofp ofr ofs ofx oia oie oif oii oio oip oir ois oo- ooa oof ooi ooo oop oor oos oox op- opa ope opf opi opo opp opr ops opx or- ora ore orf ori oro orp orr ors orx os- osa ose osf osi oso osp osr oss osx ox- oxa oxf oxi oxo oxx p-p paa pae paf pai pao pap par pas pax pea pee pef pei peo pep per pes pex pfa pfe pff pfi pfo pfp pfr pfs pfx pia pie pif pii pio pip pir pis pix poa poe pof poi poo pop por pos pox ppa ppe ppf ppi ppo ppp ppr pps ppx pra pre prf pri pro prp prr prs prx ps- psa pse psf psi pso psp psr pss psx pxe pxr pxs ra- raa rae raf rai rao rap rar ras rax re- rea ree ref rei reo rep rer res rex rfa rfe rff rfi rfo rfp rfr rfs ria rie rif rii rio rip rir ris rix roa roe rof roi roo rop ror ros rox rpa rpe rpf rpi rpo rpp rpr rps rpx rra rrf rri rrp rrr rrs rsa rse rsf rsi rso rsp rsr rss rsx rxp rxr rxs saa sae saf sai sao sap sar sas sax se- sea see sef sei seo sep ser ses sex sfa sfe sff sfi sfo sfp sfr sfs sfx sia sie sif sii sio sip sir sis six soa soe sof soi soo sop sor sos sox spa spe spf spi spo spp spr sps spx sr- sra sre srf sri sro srp srr srs srx ss- ssa sse ssf ssi sso ssp ssr sss ssx sxi sxs xaa xaf xap xar xas xee xep xer xes xex xfa xfe xfs xfx xia xie xii xio xis xix xoa xof xoi xoo xop xor xos xox xpa xpe xpf xpo xpp xps xrf xrx xsa xsi xsp xss xxi xxo xxp xxx