-er ddd dde ddi ddn ddo ddp ddr ddx de- ded dee dei den deo dep der dex di- did die dii din dio dip dir dix dnd dne dni dnn dno dnp dnr dod doe doi don doo dop dor dox dpd dpe dpi dpn dpo dpp dpr drd dre dri drn dro drp drr drx dxd dxi dxn dxo dxp dxr dxx ed- edd ede edi edn edo edp edr edx eed eee een eeo eep eer eex eid eie eii ein eio eip eir eix en- end ene eni enn eno enp enr eo- eod eoe eoi eon eoo eop eor ep- epd epe epi epn epo epp epr epx erd ere eri ern ero erp err ex- exd exe exi exo exp exr exx i-d idd ide idi idn ido idp idr idx ie- ied iee iei ien iep ier iex iid iie iii iin iio iip iir iix in- ind ine ini inn ino inp inr inx io- iod ioe ioi ion ioo iop ior ipd ipe ipi ipn ipo ipp ipr ipx ir- ird ire iri irn iro irp irr irx ixe ixi ixn n-i ndd nde ndi ndn ndo ndp ndr ne- ned nee nei nen neo nep ner nex nid nie nii nin nio nip nir nix nne nni nnn nno nnp no- nod noe noi non noo nop nor nox npd npe npi npn npo npp npr nrd nre nri nrn nro nrp nrr nrx nxd o-i odd ode odi odn odo odp odr oed oee oei oen oeo oep oer oex oid oie oii oin oio oip oir on- ond one oni onn ono onp onr onx oo- ood ooi oon ooo oop oor oox op- opd ope opi opn opo opp opr opx or- ord ore ori orn oro orp orr orx ox- oxi oxn oxo oxx p-p pdd pde pdi pdn pdo pdp pdr pdx ped pee pei pen peo pep per pex pid pie pii pin pio pip pir pix pn- pnd pne pni pnn pno pnp pnr pnx pod poe poi pon poo pop por pox ppd ppe ppi ppn ppo ppp ppr ppx prd pre pri prn pro prp prr prx pxe pxr rdd rde rdi rdn rdo rdp rdr rdx re- red ree rei ren reo rep rer rex rid rie rii rin rio rip rir rix rnd rni rnn rno rnp rnr rod roe roi ron roo rop ror rox rpd rpe rpi rpn rpo rpp rpr rpx rrd rri rrn rrp rrr rxp rxr xde xdi xdr xed xee xen xep xer xex xie xii xin xio xix xno xod xoi xon xoo xop xor xox xpd xpe xpn xpo xpp xrd xrx xxi xxo xxp xxx