throd htrod trhod rthod hrtod rhtod thord htord tohrd othrd hotrd ohtrd trohd rtohd torhd otrhd rothd orthd hrotd rhotd hortd ohrtd rohtd orhtd thrdo htrdo trhdo rthdo hrtdo rhtdo thdro htdro tdhro dthro hdtro dhtro trdho rtdho tdrho dtrho rdtho drtho hrdto rhdto hdrto dhrto rdhto drhto thodr htodr tohdr othdr hotdr ohtdr thdor htdor tdhor dthor hdtor dhtor todhr otdhr tdohr dtohr odthr dothr hodtr ohdtr hdotr dhotr odhtr dohtr trodh rtodh tordh otrdh rotdh ortdh trdoh rtdoh tdroh dtroh rdtoh drtoh todrh otdrh tdorh dtorh odtrh dotrh rodth ordth rdoth droth odrth dorth hrodt rhodt hordt ohrdt rohdt orhdt hrdot rhdot hdrot dhrot rdhot drhot hodrt ohdrt hdort dhort odhrt dohrt rodht ordht rdoht droht odrht dorht
Note: these 'words' (valid or invalid) are all the permutations of the word throd. These words are obtained by scrambling the letters in throd.