-er ddd dde ddi ddo ddp ddr dds ddx de- ded dee dei deo dep der des dex di- did die dii dio dip dir dis dix dod doe doi doo dop dor dos dox dpd dpe dpi dpo dpp dpr dps drd dre dri dro drp drr drs drx dsd dse dsi dso dsp dsr dss dsx dxd dxi dxo dxp dxr dxs dxx ed- edd ede edi edo edp edr eds edx eed eee eeo eep eer ees eex eid eie eii eio eip eir eis eix eo- eod eoe eoi eoo eop eor eos ep- epd epe epi epo epp epr eps epx erd ere eri ero erp err ers es- esd ese esi eso esp esr ess esx ex- exd exe exi exo exp exr exs exx i-d idd ide idi ido idp idr ids idx ie- ied iee iei iep ier ies iex iid iie iii iio iip iir iis iix io- iod ioe ioi ioo iop ior ios ipd ipe ipi ipo ipp ipr ips ipx ir- ird ire iri iro irp irr irs irx is- isd ise isi iso isp isr iss ixe ixi o-i odd ode odi odo odp odr ods oed oee oei oeo oep oer oes oex oid oie oii oio oip oir ois oo- ood ooi ooo oop oor oos oox op- opd ope opi opo opp opr ops opx or- ord ore ori oro orp orr ors orx os- osd ose osi oso osp osr oss osx ox- oxi oxo oxx p-p pdd pde pdi pdo pdp pdr pds pdx ped pee pei peo pep per pes pex pid pie pii pio pip pir pis pix pod poe poi poo pop por pos pox ppd ppe ppi ppo ppp ppr pps ppx prd pre pri pro prp prr prs prx ps- psd pse psi pso psp psr pss psx pxe pxr pxs rdd rde rdi rdo rdp rdr rds rdx re- red ree rei reo rep rer res rex rid rie rii rio rip rir ris rix rod roe roi roo rop ror ros rox rpd rpe rpi rpo rpp rpr rps rpx rrd rri rrp rrr rrs rsd rse rsi rso rsp rsr rss rsx rxp rxr rxs sdd sde sdi sdo sdp sdr sds se- sed see sei seo sep ser ses sex sid sie sii sio sip sir sis six sod soe soi soo sop sor sos sox spd spe spi spo spp spr sps spx sr- srd sre sri sro srp srr srs srx ss- ssd sse ssi sso ssp ssr sss ssx sxi sxs xde xdi xdr xds xed xee xep xer xes xex xie xii xio xis xix xod xoi xoo xop xor xos xox xpd xpe xpo xpp xps xrd xrx xsi xsp xss xxi xxo xxp xxx