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