creeb rceeb cereb ecreb receb erceb creeb rceeb cereb ecreb receb erceb ceerb ecerb ceerb ecerb eecrb eecrb reecb erecb reecb erecb eercb eercb crebe rcebe cerbe ecrbe recbe ercbe crbee rcbee cbree bcree rbcee brcee cebre ecbre cbere bcere ebcre becre rebce erbce rbece brece ebrce berce crebe rcebe cerbe ecrbe recbe ercbe crbee rcbee cbree bcree rbcee brcee cebre ecbre cbere bcere ebcre becre rebce erbce rbece brece ebrce berce ceebr ecebr ceebr ecebr eecbr eecbr ceber ecber cbeer bceer ebcer becer ceber ecber cbeer bceer ebcer becer eebcr eebcr ebecr beecr ebecr beecr reebc erebc reebc erebc eerbc eerbc rebec erbec rbeec breec ebrec berec rebec erbec rbeec breec ebrec berec eebrc eebrc eberc beerc eberc beerc
Note: these 'words' (valid or invalid) are all the permutations of the word creeb. These words are obtained by scrambling the letters in creeb.