-er ddd dde ddf ddi ddn ddo ddp ddr ddx de- ded dee def dei den deo dep der dex dfd dfe dff dfi dfn dfo dfp dfr dfx di- did die dif dii din dio dip dir dix dnd dne dnf dni dnn dno dnp dnr dod doe dof doi don doo dop dor dox dpd dpe dpf dpi dpn dpo dpp dpr drd dre dri drn dro drp drr drx dxd dxi dxn dxo dxp dxr dxx ed- edd ede edf edi edn edo edp edr edx eed eee eef een eeo eep eer eex ef- efd efe eff efi efo efp efr efx eid eie eif eii ein eio eip eir eix en- end ene enf eni enn eno enp enr eo- eod eoe eof eoi eon eoo eop eor ep- epd epe epf epi epn epo epp epr epx erd ere erf eri ern ero erp err ex- exd exe exi exo exp exr exx fdd fde fdf fdi fdn fdo fdp fdr fdx fed fee fef fei fen feo fep fer fex ffd ffe fff ffi ffn ffo ffp ffr ffx fid fie fif fii fin fip fir fix fnd fne fnf fni fnn fnp fnr fnx foe fof foi fon foo fop for fox fpd fpe fpi fpn fpo fpp fpr fpx frd fre frf fri frn fro frp frr fxe fxi fxp fxr fxx i-d i-f idd ide idf idi idn ido idp idr idx ie- ied iee ief iei ien iep ier iex ifd ife iff ifi ifn ifo ifp ifr ifx iid iie iif iii iin iio iip iir iix in- ind ine inf ini inn ino inp inr inx io- iod ioe iof ioi ion ioo iop ior ipd ipe ipf ipi ipn ipo ipp ipr ipx ir- ird ire irf iri irn iro irp irr irx ixe ixi ixn n-i ndd nde ndf ndi ndn ndo ndp ndr ne- ned nee nef nei nen neo nep ner nex nfd nfe nff nfi nfn nfo nfp nfr nid nie nif nii nin nio nip nir nix nne nnf nni nnn nno nnp no- nod noe nof noi non noo nop nor nox npd npe npf npi npn npo npp npr nrd nre nrf nri nrn nro nrp nrr nrx nxd o-i odd ode odf odi odn odo odp odr oed oee oef oei oen oeo oep oer oex of- ofd ofe off ofi ofn ofo ofp ofr ofx oid oie oif oii oin oio oip oir on- ond one onf oni onn ono onp onr onx oo- ood oof ooi oon ooo oop oor oox op- opd ope opf opi opn opo opp opr opx or- ord ore orf ori orn oro orp orr orx ox- oxf oxi oxn oxo oxx p-p pdd pde pdf pdi pdn pdo pdp pdr pdx ped pee pef pei pen peo pep per pex pfd pfe pff pfi pfn pfo pfp pfr pfx pid pie pif pii pin pio pip pir pix pn- pnd pne pnf pni pnn pno pnp pnr pnx pod poe pof poi pon poo pop por pox ppd ppe ppf ppi ppn ppo ppp ppr ppx prd pre prf pri prn pro prp prr prx pxe pxr rdd rde rdf rdi rdn rdo rdp rdr rdx re- red ree ref rei ren reo rep rer rex rfd rfe rff rfi rfn rfo rfp rfr rid rie rif rii rin rio rip rir rix rnd rni rnn rno rnp rnr rod roe rof roi ron roo rop ror rox rpd rpe rpf rpi rpn rpo rpp rpr rpx rrd rrf rri rrn rrp rrr rxp rxr xde xdf xdi xdr xed xee xen xep xer xex xfe xfn xfx xie xii xin xio xix xno xod xof xoi xon xoo xop xor xox xpd xpe xpf xpn xpo xpp xrd xrf xrx xxi xxo xxp xxx