ddd ddp ddr dds dpd dpp dpr dps dpv drd drp drr drs drv dsd dsp dsr dss dsv dvd dvp dvr dvs p-p pdd pdp pdr pds pdv ppd ppp ppr pps ppv prd prp prr prs prv ps- psd psp psr pss psv pvd pvp pvr pvs pvv rdd rdp rdr rds rdv rpd rpp rpr rps rpv rrd rrp rrr rrs rsd rsp rsr rss rsv rvd rvp rvr rvs rvv sdd sdp sdr sds sdv spd spp spr sps spv sr- srd srp srr srs srv ss- ssd ssp ssr sss ssv svd svp svr svs svv vdd vdp vdr vds vdv vpd vpp vpr vps vrd vrp vrr vrs vsd vsp vsr vss vsv vvr vvs vvv