thred htred trhed rthed hrted rhted therd hterd tehrd ethrd hetrd ehtrd trehd rtehd terhd etrhd rethd erthd hretd rhetd hertd ehrtd rehtd erhtd thrde htrde trhde rthde hrtde rhtde thdre htdre tdhre dthre hdtre dhtre trdhe rtdhe tdrhe dtrhe rdthe drthe hrdte rhdte hdrte dhrte rdhte drhte thedr htedr tehdr ethdr hetdr ehtdr thder htder tdher dther hdter dhter tedhr etdhr tdehr dtehr edthr dethr hedtr ehdtr hdetr dhetr edhtr dehtr tredh rtedh terdh etrdh retdh ertdh trdeh rtdeh tdreh dtreh rdteh drteh tedrh etdrh tderh dterh edtrh detrh redth erdth rdeth dreth edrth derth hredt rhedt herdt ehrdt rehdt erhdt hrdet rhdet hdret dhret rdhet drhet hedrt ehdrt hdert dhert edhrt dehrt redht erdht rdeht dreht edrht derht
Note: these 'words' (valid or invalid) are all the permutations of the word thred. These words are obtained by scrambling the letters in thred.