shrow hsrow srhow rshow hrsow rhsow shorw hsorw sohrw oshrw hosrw ohsrw srohw rsohw sorhw osrhw roshw orshw hrosw rhosw horsw ohrsw rohsw orhsw shrwo hsrwo srhwo rshwo hrswo rhswo shwro hswro swhro wshro hwsro whsro srwho rswho swrho wsrho rwsho wrsho hrwso rhwso hwrso whrso rwhso wrhso showr hsowr sohwr oshwr hoswr ohswr shwor hswor swhor wshor hwsor whsor sowhr oswhr swohr wsohr owshr woshr howsr ohwsr hwosr whosr owhsr wohsr srowh rsowh sorwh osrwh roswh orswh srwoh rswoh swroh wsroh rwsoh wrsoh sowrh oswrh sworh wsorh owsrh wosrh rowsh orwsh rwosh wrosh owrsh worsh hrows rhows horws ohrws rohws orhws hrwos rhwos hwros whros rwhos wrhos howrs ohwrs hwors whors owhrs wohrs rowhs orwhs rwohs wrohs owrhs worhs
Note: these 'words' (valid or invalid) are all the permutations of the word shrow. These words are obtained by scrambling the letters in shrow.