shirr hsirr sihrr ishrr hisrr ihsrr shrir hsrir srhir rshir hrsir rhsir sirhr isrhr srihr rsihr irshr rishr hirsr ihrsr hrisr rhisr irhsr rihsr shirr hsirr sihrr ishrr hisrr ihsrr shrir hsrir srhir rshir hrsir rhsir sirhr isrhr srihr rsihr irshr rishr hirsr ihrsr hrisr rhisr irhsr rihsr shrri hsrri srhri rshri hrsri rhsri shrri hsrri srhri rshri hrsri rhsri srrhi rsrhi srrhi rsrhi rrshi rrshi hrrsi rhrsi hrrsi rhrsi rrhsi rrhsi sirrh isrrh srirh rsirh irsrh risrh sirrh isrrh srirh rsirh irsrh risrh srrih rsrih srrih rsrih rrsih rrsih irrsh rirsh irrsh rirsh rrish rrish hirrs ihrrs hrirs rhirs irhrs rihrs hirrs ihrrs hrirs rhirs irhrs rihrs hrris rhris hrris rhris rrhis rrhis irrhs rirhs irrhs rirhs rrihs rrihs
Note: these 'words' (valid or invalid) are all the permutations of the word shirr. These words are obtained by scrambling the letters in shirr.