bbbb bbbs bblb bbls bbpr bffl bffs bfpp bfsr blls blsp blss blub bluf blup blur blus bpfl bpsu brfu brlp brls brrr brrs brsb brsr brup brus bsff bsfs bspp bspr bsup bubb bubs bubu buff bufr bulb bull buls bulu bups bur- burb burl burp burr burs buru buss busu buus fbrs fbus ffff ffps ffrr ffss flub fluf flur flus fprf frps frsb frub fspf fssf fssp fubb fubs fubu fuff fufu full fuls fulu fur- furl furr furs fuss fusu lblr lbrs llbs llll llps lpfp lppl lprp lpss lrps lrpu lrrr ls-r lsbu lspl lspr lssp lssr lubs luff lufu lull lulu lupu lurs luss luup pblu pbrf pbrs pbsp pfff pffr pfps plbr plff plpp plss plup plur plus pppp ppps pprf ppru ppsf ppss ppur prbs prfs prlr prls prps prrs prsl prss pruf prus pruu psbr psfs pspp pspr psps psrp publ pubs pubu puff pull pulp puls pulu pupl pups pupu pur- purb purl purp purr purs puru puss rbbb rbbr rbbs rbsl rbsp rbss rffl rlls rpls rpps rrrr rrsp rslp rspb rsps rssl rubb rubp rubs rubu ruff rull rupp rurp rurs ruru russ rusu sbbs sbsp sbus sfls sfss sfsu slbp sllp slpp slps slrp slrs slsu slub slup slur spfs splp splr spls sppf spps sprs spsp spss spur spus srps srsp srub ssbr ssfl ssfp sslp sspf sspl ssps ssrl ssrs sssb sssf ssss sub- subb subl subs suf- suff sufr sufs sufu sul- sulf sull sulp sulu sup- supp supr sups sur- surf surp surr surs suru sus- susp suss susu suus u-rp ubls ufpb ullr ulul ulus uplb uppp uppu upup urbs urff urls urss ursu urup urur urus usbl usbr usbs usfl usfs uslp uslu uspp usps ussb ussf ussr usss ussu usul usus uulu uuuu