dddd ddps ddss ddts dpdt dpsd dpst dpsu dpts drrs drsp drup drus drut druu dsdp dsdr dsps dspt dsrp dsrr dssp dsst dsts dtdp dtss dttp dudd duds dudu durt duru dust dutp duts duur duut pdpr pdrs pdsd pdss ppds pppd pppp ppps ppru ppss ppts pptt ppur prpd prps prrd prrs prsd prss prtp prtr prud prus prut pruu psdp psdr psds pspp pspr psps psrd psrp psst psts pstu ptpd ptrd ptsd puds pudu pups pupu pur- purp purr purs puru pusd puss pust put- puts putt putu rpdp rpps rptd rpts rrrr rrsp rsdd rsds rsps rstp rsts rstu rtdt rtps rtss rttp rtts rudd rudp ruds rupp rupt rurd rurp rurs ruru russ rust rusu ruts rutt rutu ruud sdds sdpr sdps sdrs sdss sdsu spdp spdr spdt sppd spps sprd sprs spsd spsp spss spst sptr spts spud spur spus sput srps srpt srsd srsp srtp srtr ssdd ssdp ssps sspt ssrs ssss sstd sstp ssts stds stpd stpp stps strd strs stru stss sttd sttr stud stup stur stus stut sudd suds sup- supp supr sups supt sur- surd surp surr surs surt suru sus- susd susp suss sust susu sutu suus tdss tpdu tppd tppp tppr tprs tptp tptr tput trpp trps trsd trst trtr trud trus trut truu tsps tspt tssr tsst tsts tsup ttss tttt tudu tups tupu turd turp turr turs turt turu tusd tuss tust tuts tutt tutu u-rp udds udpd udsd udts uppp uppu upup urds urdu urss ursu urts urup urur urus urut usdp usds usdt uspp usps ussr usss usst ussu ustp usts usus utpd uttu uuuu