-er ddd dde ddp ddr dds de- ded dee dep der des dev dpd dpe dpp dpr dps dpv drd dre drp drr drs drv dsd dse dsp dsr dss dsv dvd dve dvp dvr dvs ed- edd ede edp edr eds eed eee eep eer ees eev ep- epd epe epp epr eps erd ere erp err ers erv es- esd ese esp esr ess esv evd eve evp evr evs evv p-p pdd pde pdp pdr pds pdv ped pee pep per pes pev ppd ppe ppp ppr pps ppv prd pre prp prr prs prv ps- psd pse psp psr pss psv pvd pve pvp pvr pvs pvv rdd rde rdp rdr rds rdv re- red ree rep rer res rev rpd rpe rpp rpr rps rpv rrd rrp rrr rrs rsd rse rsp rsr rss rsv rvd rve rvp rvr rvs rvv sdd sde sdp sdr sds sdv se- sed see sep ser ses sev spd spe spp spr sps spv sr- srd sre srp srr srs srv ss- ssd sse ssp ssr sss ssv svd sve svp svr svs svv v-e vdd vde vdp vdr vds vdv ved vee vep ver ves vpd vpe vpp vpr vps vrd vre vrp vrr vrs vsd vse vsp vsr vss vsv vvr vvs vvv