-er ddd dde ddf ddh ddi ddo ddp ddr ddx de- ded dee def deh dei deo dep der dex dfd dfe dff dfh dfi dfo dfp dfr dfx dh- dhd dhe dhf dhh dhi dho dhp dhr di- did die dif dih dii dio dip dir dix dod doe dof doh doi doo dop dor dox dpd dpe dpf dph dpi dpo dpp dpr drd dre dri dro drp drr drx dxd dxi dxo dxp dxr dxx ed- edd ede edf edh edi edo edp edr edx eed eee eef eeo eep eer eex ef- efd efe eff efh efi efo efp efr efx ehd ehe ehf ehh ehi eho ehp ehr eid eie eif eii eio eip eir eix eo- eod eoe eof eoh eoi eoo eop eor ep- epd epe epf eph epi epo epp epr epx erd ere erf erh eri ero erp err ex- exd exe exh exi exo exp exr exx fdd fde fdf fdh fdi fdo fdp fdr fdx fed fee fef feh fei feo fep fer fex ffd ffe fff ffh ffi ffo ffp ffr ffx fhe fhf fhh fhi fho fhp fhr fid fie fif fih fii fip fir fix foe fof foh foi foo fop for fox fpd fpe fph fpi fpo fpp fpr fpx frd fre frf frh fri fro frp frr fxe fxi fxp fxr fxx h-i hdd hde hdf hdh hdi hdo hdp hdr hdx he- hed hee hef heh hei heo hep her hex hfd hfe hff hfh hfi hfo hfp hfr hhd hhe hhf hhh hhi hho hhp hhr hid hie hif hih hii hio hip hir hix hod hoe hof hoh hoi hoo hop hor hox hpd hpe hpf hph hpi hpo hpp hpr hr- hrd hre hrf hrh hri hro hrp hrr hxd i-d i-f idd ide idf idh idi ido idp idr idx ie- ied iee ief iei iep ier iex ifd ife iff ifi ifo ifp ifr ifx ihd ihe ihf ihh ihi iho ihp ihr iid iie iif iih iii iio iip iir iix io- iod ioe iof ioh ioi ioo iop ior ipd ipe ipf ipi ipo ipp ipr ipx ir- ird ire irf iri iro irp irr irx ixe ixi o-i odd ode odf odh odi odo odp odr oed oee oef oeh oei oeo oep oer oex of- ofd ofe off ofi ofo ofp ofr ofx ohd ohe ohf ohh ohi oho ohp ohr oid oie oif oii oio oip oir oo- ood oof ooh ooi ooo oop oor oox op- opd ope opf oph opi opo opp opr opx or- ord ore orf orh ori oro orp orr orx ox- oxf oxi oxo oxx p-p pdd pde pdf pdh pdi pdo pdp pdr pdx ped pee pef peh pei peo pep per pex pfd pfe pff pfi pfo pfp pfr pfx phd phe phf phi pho php phr phx pid pie pif pih pii pio pip pir pix pod poe pof poh poi poo pop por pox ppd ppe ppf pph ppi ppo ppp ppr ppx prd pre prf prh pri pro prp prr prx pxe pxr rdd rde rdf rdh rdi rdo rdp rdr rdx re- red ree ref reh rei reo rep rer rex rfd rfe rff rfh rfi rfo rfp rfr rh- rhd rhe rhf rhh rhi rho rhp rhr rid rie rif rih rii rio rip rir rix rod roe rof roh roi roo rop ror rox rpd rpe rpf rph rpi rpo rpp rpr rpx rrd rrf rrh rri rrp rrr rxp rxr xde xdf xdh xdi xdr xed xee xep xer xex xfe xfh xfx xhd xhp xie xii xio xix xod xof xoi xoo xop xor xox xpd xpe xpf xpo xpp xrd xrf xrx xxi xxo xxp xxx