-er ddd dde ddi ddo ddp ddr de- ded dee dei deo dep der dev di- did die dii dio dip dir div dod doe doi doo dop dor dov dpd dpe dpi dpo dpp dpr dpv drd dre dri dro drp drr drv dvd dve dvi dvp dvr ed- edd ede edi edo edp edr eed eee eeo eep eer eev eid eie eii eio eip eir eiv eo- eod eoe eoi eoo eop eor ep- epd epe epi epo epp epr erd ere eri ero erp err erv evd eve evi evo evp evr evv i-d i-v idd ide idi ido idp idr idv ie- ied iee iei iep ier iev iid iie iii iio iip iir io- iod ioe ioi ioo iop ior iov ipd ipe ipi ipo ipp ipr ipv ir- ird ire iri iro irp irr irv ivd ive ivi ivo ivp ivr ivv o-i odd ode odi odo odp odr odv oed oee oei oeo oep oer oid oie oii oio oip oir oiv oo- ood ooi ooo oop oor oov op- opd ope opi opo opp opr opv or- ord ore ori oro orp orr orv ov- ovd ove ovi ovo ovp ovv p-p pdd pde pdi pdo pdp pdr pdv ped pee pei peo pep per pev pid pie pii pio pip pir piv pod poe poi poo pop por pov ppd ppe ppi ppo ppp ppr ppv prd pre pri pro prp prr prv pvd pve pvi pvo pvp pvr pvv rdd rde rdi rdo rdp rdr rdv re- red ree rei reo rep rer rev rid rie rii rio rip rir riv rod roe roi roo rop ror rov rpd rpe rpi rpo rpp rpr rpv rrd rri rrp rrr rvd rve rvi rvo rvp rvr rvv v-e vdd vde vdi vdo vdp vdr vdv ved vee vei veo vep ver vi- vid vie vii vio vip vir viv vod voe voi voo vop vor vov vpd vpe vpi vpo vpp vpr vrd vre vri vrp vrr vvi vvo vvr vvv