curbs ucrbs crubs rcubs urcbs rucbs cubrs ucbrs cburs bcurs ubcrs bucrs crbus rcbus cbrus bcrus rbcus brcus urbcs rubcs ubrcs burcs rbucs brucs cursb ucrsb crusb rcusb urcsb rucsb cusrb ucsrb csurb scurb uscrb sucrb crsub rcsub csrub scrub rscub srcub urscb ruscb usrcb surcb rsucb srucb cubsr ucbsr cbusr bcusr ubcsr bucsr cusbr ucsbr csubr scubr uscbr sucbr cbsur bcsur csbur scbur bscur sbcur ubscr buscr usbcr subcr bsucr sbucr crbsu rcbsu cbrsu bcrsu rbcsu brcsu crsbu rcsbu csrbu scrbu rscbu srcbu cbsru bcsru csbru scbru bscru sbcru rbscu brscu rsbcu srbcu bsrcu sbrcu urbsc rubsc ubrsc bursc rbusc brusc ursbc rusbc usrbc surbc rsubc srubc ubsrc busrc usbrc subrc bsurc sburc rbsuc brsuc rsbuc srbuc bsruc sbruc
Note: these 'words' (valid or invalid) are all the permutations of the word curbs. These words are obtained by scrambling the letters in curbs.