-er ddd dde ddi ddo ddp ddr ddx de- ded dee dei deo dep der dev dex di- did die dii dio dip dir div dix dod doe doi doo dop dor dov dox dpd dpe dpi dpo dpp dpr dpv drd dre dri dro drp drr drv drx dvd dve dvi dvp dvr dvx dxd dxi dxo dxp dxr dxx ed- edd ede edi edo edp edr edx eed eee eeo eep eer eev eex eid eie eii eio eip eir eiv eix eo- eod eoe eoi eoo eop eor ep- epd epe epi epo epp epr epx erd ere eri ero erp err erv evd eve evi evo evp evr evv ex- exd exe exi exo exp exr exx i-d i-v idd ide idi ido idp idr idv idx ie- ied iee iei iep ier iev iex iid iie iii iio iip iir iix io- iod ioe ioi ioo iop ior iov ipd ipe ipi ipo ipp ipr ipv ipx ir- ird ire iri iro irp irr irv irx ivd ive ivi ivo ivp ivr ivv ivx ixe ixi o-i odd ode odi odo odp odr odv oed oee oei oeo oep oer oex oid oie oii oio oip oir oiv oo- ood ooi ooo oop oor oov oox op- opd ope opi opo opp opr opv opx or- ord ore ori oro orp orr orv orx ov- ovd ove ovi ovo ovp ovv ox- oxi oxo oxx p-p pdd pde pdi pdo pdp pdr pdv pdx ped pee pei peo pep per pev pex pid pie pii pio pip pir piv pix pod poe poi poo pop por pov pox ppd ppe ppi ppo ppp ppr ppv ppx prd pre pri pro prp prr prv prx pvd pve pvi pvo pvp pvr pvv pxe pxr rdd rde rdi rdo rdp rdr rdv rdx re- red ree rei reo rep rer rev rex rid rie rii rio rip rir riv rix rod roe roi roo rop ror rov rox rpd rpe rpi rpo rpp rpr rpv rpx rrd rri rrp rrr rvd rve rvi rvo rvp rvr rvv rxp rxr v-e vdd vde vdi vdo vdp vdr vdv vdx ved vee vei veo vep ver vex vi- vid vie vii vio vip vir viv vix vod voe voi voo vop vor vov vox vpd vpe vpi vpo vpp vpr vpx vrd vre vri vrp vrr vvi vvo vvr vvv vxd vxr vxv xde xdi xdr xdv xed xee xep xer xev xex xie xii xio xiv xix xod xoi xoo xop xor xov xox xpd xpe xpo xpp xrd xrx xvi xxi xxo xxp xxv xxx