dddd ddps ddss dnus dpsd dpsu drrs drsp drup drus druu dsdp dsdr dsps dsrp dsrr dssn dssp dudd duds dudu dunn duns durn duru duur n-up ndnp ndpd ndpr ndps ndss nnnn nnpr nnss nppd npss nrds nrpn nrps nrrd nrsp nsds nsnr nsps nsrd nssp nssr nsss nudd nunn nuns nups nurd nurn nurp nurr nurs nuru nuss nusu pdns pdpn pdpr pdrs pdsd pdss pnpp pnup ppds pppd pppn pppp ppps ppru ppss ppur prnd prnp prpd prps prrd prrs prsd prss prud prus pruu psdp psdr psds psnr pspp pspr psps psrd psrp puds pudu pund puns punu pups pupu pur- purp purr purs puru pusd puss rndp rnds rnsp rpdp rppn rpps rrrr rrsp rrun rsdd rsds rsnn rsnr rsps rudd rudp ruds rund runn runs rupp rurd rurp rurs ruru russ rusu ruud ruun sdds sdpr sdps sdrs sdss sdsu snns snpp snrs snsd snur snus spdp spdr spns sppd spps sprd sprs spsd spsp spss spud spun spur spus srnn srps srsd srsp ssdd ssdp ssns ssps ssrs ssss sudd suds sun- sund sunn suns sunu sup- supp supr sups sur- surd surn surp surr surs suru sus- susd susp suss susu suus u-rp udds udpd udsd udun unds unns unps unrs uns- unus upnp uppp uppu upup urds urdu urns urss ursu urun urup urur urus usdp usds usnr usnu uspp usps ussr usss ussu usun usus uuuu