durrs udrrs drurs rdurs urdrs rudrs durrs udrrs drurs rdurs urdrs rudrs drrus rdrus drrus rdrus rrdus rrdus urrds rurds urrds rurds rruds rruds dursr udrsr drusr rdusr urdsr rudsr dusrr udsrr dsurr sdurr usdrr sudrr drsur rdsur dsrur sdrur rsdur srdur ursdr rusdr usrdr surdr rsudr srudr dursr udrsr drusr rdusr urdsr rudsr dusrr udsrr dsurr sdurr usdrr sudrr drsur rdsur dsrur sdrur rsdur srdur ursdr rusdr usrdr surdr rsudr srudr drrsu rdrsu drrsu rdrsu rrdsu rrdsu drsru rdsru dsrru sdrru rsdru srdru drsru rdsru dsrru sdrru rsdru srdru rrsdu rrsdu rsrdu srrdu rsrdu srrdu urrsd rursd urrsd rursd rrusd rrusd ursrd rusrd usrrd surrd rsurd srurd ursrd rusrd usrrd surrd rsurd srurd rrsud rrsud rsrud srrud rsrud srrud
Note: these 'words' (valid or invalid) are all the permutations of the word durrs. These words are obtained by scrambling the letters in durrs.