raceb arceb rcaeb craeb acreb careb raecb arecb reacb eracb aercb earcb rceab creab recab ercab cerab ecrab acerb caerb aecrb eacrb cearb ecarb racbe arcbe rcabe crabe acrbe carbe rabce arbce rbace brace abrce barce rcbae crbae rbcae brcae cbrae bcrae acbre cabre abcre bacre cbare bcare raebc arebc reabc erabc aerbc earbc rabec arbec rbaec braec abrec barec rebac erbac rbeac breac ebrac berac aebrc eabrc aberc baerc ebarc bearc rceba creba recba ercba cerba ecrba rcbea crbea rbcea brcea cbrea bcrea rebca erbca rbeca breca ebrca berca cebra ecbra cbera bcera ebcra becra acebr caebr aecbr eacbr ceabr ecabr acber caber abcer bacer cbaer bcaer aebcr eabcr abecr baecr ebacr beacr cebar ecbar cbear bcear ebcar becar
Note: these 'words' (valid or invalid) are all the permutations of the word raceb. These words are obtained by scrambling the letters in raceb.