currs ucrrs crurs rcurs urcrs rucrs currs ucrrs crurs rcurs urcrs rucrs crrus rcrus crrus rcrus rrcus rrcus urrcs rurcs urrcs rurcs rrucs rrucs cursr ucrsr crusr rcusr urcsr rucsr cusrr ucsrr csurr scurr uscrr sucrr crsur rcsur csrur scrur rscur srcur urscr ruscr usrcr surcr rsucr srucr cursr ucrsr crusr rcusr urcsr rucsr cusrr ucsrr csurr scurr uscrr sucrr crsur rcsur csrur scrur rscur srcur urscr ruscr usrcr surcr rsucr srucr crrsu rcrsu crrsu rcrsu rrcsu rrcsu crsru rcsru csrru scrru rscru srcru crsru rcsru csrru scrru rscru srcru rrscu rrscu rsrcu srrcu rsrcu srrcu urrsc rursc urrsc rursc rrusc rrusc ursrc rusrc usrrc surrc rsurc srurc ursrc rusrc usrrc surrc rsurc srurc rrsuc rrsuc rsruc srruc rsruc srruc
Note: these 'words' (valid or invalid) are all the permutations of the word currs. These words are obtained by scrambling the letters in currs.