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