ffff ffps ffrr ffss fprf frps frys fspf fssf fssp fuff fufu fur- furr furs fury fuss fusu fuyu fyrs fyry pfff pffr pfps pppp ppps pprf ppru ppsf ppss ppur prfs prps prrs prss pruf prus pruu prys psfs pspp pspr psps psrp psy- psys puff pups pupu pupy pur- purp purr purs puru pury puss puy- puys pypy pyr- pyry pyss rpps rrrr rrsp rsps ruff rupp rupy rurp rurs ruru russ rusu rusy ruys ryff rysy ryyf sfss sfsu spfs sppf spps sprs spry spsp spss spur spus spy- spyr spys srps srsp ssfp sspf ssps ssrs sssf ssss suf- suff sufr sufs sufu sup- supp supr sups supy sur- surf surp surr surs suru sury sus- susp suss susu susy suus suyr suyu syff syfy syrs syry syss u-rp uppp uppu uppy upsy upup urff urry urss ursu ursy urup urur urus usfs uspp usps ussf ussr usss ussu ussy usus uuuu yssu yuff yufu yups yury yuyu yyff yyyy