srlte rslte slrte lsrte rlste lrste srtle rstle strle tsrle rtsle trsle sltre lstre stlre tslre ltsre tlsre rltse lrtse rtlse trlse ltrse tlrse srlet rslet slret lsret rlset lrset srelt rselt serlt esrlt reslt erslt slert lsert selrt eslrt lesrt elsrt rlest lrest relst erlst lerst elrst srtel rstel strel tsrel rtsel trsel sretl rsetl sertl esrtl restl erstl sterl tserl setrl estrl tesrl etsrl rtesl tresl retsl ertsl tersl etrsl slter lster stler tsler ltser tlser sletr lsetr seltr esltr lestr elstr stelr tselr setlr estlr teslr etslr ltesr tlesr letsr eltsr telsr etlsr rltes lrtes rtles trles ltres tlres rlets lrets relts erlts lerts elrts rtels trels retls ertls terls etrls lters tlers letrs eltrs telrs etlrs
Note: these 'words' (valid or invalid) are all the permutations of the word srlte. These words are obtained by scrambling the letters in srlte.