-er ddd dde ddf ddi ddp ddr de- ded dee def dei dep der dev dfd dfe dff dfi dfp dfr dfv di- did die dif dii dip dir div dpd dpe dpf dpi dpp dpr dpv drd dre dri drp drr drv dvd dve dvi dvp dvr ed- edd ede edf edi edp edr eed eee eef eep eer eev ef- efd efe eff efi efp efr eid eie eif eii eip eir eiv ep- epd epe epf epi epp epr erd ere erf eri erp err erv evd eve evf evi evp evr evv fdd fde fdf fdi fdp fdr fed fee fef fei fep fer fev ffd ffe fff ffi ffp ffr ffv fid fie fif fii fip fir fpd fpe fpi fpp fpr fpv frd fre frf fri frp frr fvd fvp i-d i-f i-v idd ide idf idi idp idr idv ie- ied iee ief iei iep ier iev ifd ife iff ifi ifp ifr iid iie iif iii iip iir ipd ipe ipf ipi ipp ipr ipv ir- ird ire irf iri irp irr irv ivd ive ivf ivi ivp ivr ivv p-p pdd pde pdf pdi pdp pdr pdv ped pee pef pei pep per pev pfd pfe pff pfi pfp pfr pfv pid pie pif pii pip pir piv ppd ppe ppf ppi ppp ppr ppv prd pre prf pri prp prr prv pvd pve pvf pvi pvp pvr pvv rdd rde rdf rdi rdp rdr rdv re- red ree ref rei rep rer rev rfd rfe rff rfi rfp rfr rfv rid rie rif rii rip rir riv rpd rpe rpf rpi rpp rpr rpv rrd rrf rri rrp rrr rvd rve rvf rvi rvp rvr rvv v-e vdd vde vdf vdi vdp vdr vdv ved vee vef vei vep ver vfd vff vfi vfp vfr vfv vi- vid vie vif vii vip vir viv vpd vpe vpf vpi vpp vpr vrd vre vrf vri vrp vrr vvi vvr vvv