n-up nnnn nnpr nnss npss nrpn nrps nrsp nsnr nsps nssp nssr nsss nunn nuns nups nurn nurp nurr nurs nuru nuss nusu pnpp pnup pppn pppp ppps ppru ppss ppur prnp prps prrs prss prus pruu psnr pspp pspr psps psrp puns punu pups pupu pur- purp purr purs puru puss rnsp rppn rpps rrrr rrsp rrun rsnn rsnr rsps runn runs rupp rurp rurs ruru russ rusu ruun snns snpp snrs snur snus spns spps sprs spsp spss spun spur spus srnn srps srsp ssns ssps ssrs ssss sun- sunn suns sunu sup- supp supr sups sur- surn surp surr surs suru sus- susp suss susu suus u-rp unns unps unrs uns- unus upnp uppp uppu upup urns urss ursu urun urup urur urus usnr usnu uspp usps ussr usss ussu usun usus uuuu