llll llps lppl lprp lpss lrps lrpu lrrr ls-r lspl lspr lssp lssr lull lulu lupu lurs luss luup plpp plss plup plur plus pppp ppps ppru ppss ppur prlr prls prps prrs prsl prss prus pruu pspp pspr psps psrp pull pulp puls pulu pupl pups pupu pur- purl purp purr purs puru puss rlls rpls rpps rrrr rrsp rslp rsps rssl rull rupp rurp rurs ruru russ rusu sllp slpp slps slrp slrs slsu slup slur splp splr spls spps sprs spsp spss spur spus srps srsp sslp sspl ssps ssrl ssrs ssss sul- sull sulp sulu sup- supp supr sups sur- surp surr surs suru sus- susp suss susu suus u-rp ullr ulul ulus uppp uppu upup urls urss ursu urup urur urus uslp uslu uspp usps ussr usss ussu usul usus uulu uuuu