purrs uprrs prurs rpurs urprs ruprs purrs uprrs prurs rpurs urprs ruprs prrus rprus prrus rprus rrpus rrpus urrps rurps urrps rurps rrups rrups pursr uprsr prusr rpusr urpsr rupsr pusrr upsrr psurr spurr usprr suprr prsur rpsur psrur sprur rspur srpur urspr ruspr usrpr surpr rsupr srupr pursr uprsr prusr rpusr urpsr rupsr pusrr upsrr psurr spurr usprr suprr prsur rpsur psrur sprur rspur srpur urspr ruspr usrpr surpr rsupr srupr prrsu rprsu prrsu rprsu rrpsu rrpsu prsru rpsru psrru sprru rspru srpru prsru rpsru psrru sprru rspru srpru rrspu rrspu rsrpu srrpu rsrpu srrpu urrsp rursp urrsp rursp rrusp rrusp ursrp rusrp usrrp surrp rsurp srurp ursrp rusrp usrrp surrp rsurp srurp rrsup rrsup rsrup srrup rsrup srrup
Note: these 'words' (valid or invalid) are all the permutations of the word purrs. These words are obtained by scrambling the letters in purrs.