shirt hsirt sihrt ishrt hisrt ihsrt shrit hsrit srhit rshit hrsit rhsit sirht isrht sriht rsiht irsht risht hirst ihrst hrist rhist irhst rihst shitr hsitr sihtr ishtr histr ihstr shtir hstir sthir tshir htsir thsir sithr isthr stihr tsihr itshr tishr hitsr ihtsr htisr thisr ithsr tihsr shrti hsrti srhti rshti hrsti rhsti shtri hstri sthri tshri htsri thsri srthi rsthi strhi tsrhi rtshi trshi hrtsi rhtsi htrsi thrsi rthsi trhsi sirth isrth srith rsith irsth risth sitrh istrh stirh tsirh itsrh tisrh srtih rstih strih tsrih rtsih trsih irtsh ritsh itrsh tirsh rtish trish hirts ihrts hrits rhits irhts rihts hitrs ihtrs htirs thirs ithrs tihrs hrtis rhtis htris thris rthis trhis irths riths itrhs tirhs rtihs trihs
Note: these 'words' (valid or invalid) are all the permutations of the word shirt. These words are obtained by scrambling the letters in shirt.