duroc udroc druoc rduoc urdoc rudoc duorc udorc dourc odurc uodrc oudrc drouc rdouc doruc odruc roduc orduc urodc ruodc uordc ourdc roudc orudc durco udrco druco rduco urdco rudco ducro udcro dcuro cduro ucdro cudro drcuo rdcuo dcruo cdruo rcduo crduo urcdo rucdo ucrdo curdo rcudo crudo duocr udocr doucr oducr uodcr oudcr ducor udcor dcuor cduor ucdor cudor docur odcur dcour cdour ocdur codur uocdr oucdr ucodr cuodr ocudr coudr drocu rdocu dorcu odrcu rodcu ordcu drcou rdcou dcrou cdrou rcdou crdou docru odcru dcoru cdoru ocdru codru rocdu orcdu rcodu crodu ocrdu cordu urocd ruocd uorcd ourcd roucd orucd urcod rucod ucrod curod rcuod cruod uocrd oucrd ucord cuord ocurd courd rocud orcud rcoud croud ocrud corud
Note: these 'words' (valid or invalid) are all the permutations of the word duroc. These words are obtained by scrambling the letters in duroc.