shris hsris srhis rshis hrsis rhsis shirs hsirs sihrs ishrs hisrs ihsrs srihs rsihs sirhs isrhs rishs irshs hriss rhiss hirss ihrss rihss irhss shrsi hsrsi srhsi rshsi hrssi rhssi shsri hssri sshri sshri hssri shsri srshi rsshi ssrhi ssrhi rsshi srshi hrssi rhssi hsrsi shrsi rshsi srhsi shisr hsisr sihsr ishsr hissr ihssr shsir hssir sshir sshir hssir shsir sishr isshr ssihr ssihr isshr sishr hissr ihssr hsisr shisr ishsr sihsr srish rsish sirsh isrsh rissh irssh srsih rssih ssrih ssrih rssih srsih sisrh issrh ssirh ssirh issrh sisrh rissh irssh rsish srish isrsh sirsh hriss rhiss hirss ihrss rihss irhss hrsis rhsis hsris shris rshis srhis hisrs ihsrs hsirs shirs ishrs sihrs rishs irshs rsihs srihs isrhs sirhs
Note: these 'words' (valid or invalid) are all the permutations of the word shris. These words are obtained by scrambling the letters in shris.