-er ddd dde ddf ddi ddo ddp ddr dds ddx de- ded dee def dei deo dep der des dex dfd dfe dff dfi dfo dfp dfr dfs dfx di- did die dif dii dio dip dir dis dix dod doe dof doi doo dop dor dos dox dpd dpe dpf dpi dpo dpp dpr dps drd dre dri dro drp drr drs drx dsd dse dsf dsi dso dsp dsr dss dsx dxd dxi dxo dxp dxr dxs dxx ed- edd ede edf edi edo edp edr eds edx eed eee eef eeo eep eer ees eex ef- efd efe eff efi efo efp efr efs efx eid eie eif eii eio eip eir eis eix eo- eod eoe eof eoi eoo eop eor eos ep- epd epe epf epi epo epp epr eps epx erd ere erf eri ero erp err ers es- esd ese esf esi eso esp esr ess esx ex- exd exe exi exo exp exr exs exx fdd fde fdf fdi fdo fdp fdr fds fdx fed fee fef fei feo fep fer fes fex ffd ffe fff ffi ffo ffp ffr ffs ffx fid fie fif fii fip fir fis fix foe fof foi foo fop for fos fox fpd fpe fpi fpo fpp fpr fps fpx frd fre frf fri fro frp frr frs fsd fse fsf fsi fso fsp fsr fss fsx fxe fxi fxp fxr fxs fxx i-d i-f idd ide idf idi ido idp idr ids idx ie- ied iee ief iei iep ier ies iex ifd ife iff ifi ifo ifp ifr ifs ifx iid iie iif iii iio iip iir iis iix io- iod ioe iof ioi ioo iop ior ios ipd ipe ipf ipi ipo ipp ipr ips ipx ir- ird ire irf iri iro irp irr irs irx is- isd ise isf isi iso isp isr iss ixe ixi o-i odd ode odf odi odo odp odr ods oed oee oef oei oeo oep oer oes oex of- ofd ofe off ofi ofo ofp ofr ofs ofx oid oie oif oii oio oip oir ois oo- ood oof ooi ooo oop oor oos oox op- opd ope opf opi opo opp opr ops opx or- ord ore orf ori oro orp orr ors orx os- osd ose osf osi oso osp osr oss osx ox- oxf oxi oxo oxx p-p pdd pde pdf pdi pdo pdp pdr pds pdx ped pee pef pei peo pep per pes pex pfd pfe pff pfi pfo pfp pfr pfs pfx pid pie pif pii pio pip pir pis pix pod poe pof poi poo pop por pos pox ppd ppe ppf ppi ppo ppp ppr pps ppx prd pre prf pri pro prp prr prs prx ps- psd pse psf psi pso psp psr pss psx pxe pxr pxs rdd rde rdf rdi rdo rdp rdr rds rdx re- red ree ref rei reo rep rer res rex rfd rfe rff rfi rfo rfp rfr rfs rid rie rif rii rio rip rir ris rix rod roe rof roi roo rop ror ros rox rpd rpe rpf rpi rpo rpp rpr rps rpx rrd rrf rri rrp rrr rrs rsd rse rsf rsi rso rsp rsr rss rsx rxp rxr rxs sdd sde sdf sdi sdo sdp sdr sds se- sed see sef sei seo sep ser ses sex sfd sfe sff sfi sfo sfp sfr sfs sfx sid sie sif sii sio sip sir sis six sod soe sof soi soo sop sor sos sox spd spe spf spi spo spp spr sps spx sr- srd sre srf sri sro srp srr srs srx ss- ssd sse ssf ssi sso ssp ssr sss ssx sxi sxs xde xdf xdi xdr xds xed xee xep xer xes xex xfe xfs xfx xie xii xio xis xix xod xof xoi xoo xop xor xos xox xpd xpe xpf xpo xpp xps xrd xrf xrx xsi xsp xss xxi xxo xxp xxx