drith rdith dirth idrth ridth irdth drtih rdtih dtrih tdrih rtdih trdih ditrh idtrh dtirh tdirh itdrh tidrh ritdh irtdh rtidh tridh itrdh tirdh driht rdiht dirht idrht ridht irdht drhit rdhit dhrit hdrit rhdit hrdit dihrt idhrt dhirt hdirt ihdrt hidrt rihdt irhdt rhidt hridt ihrdt hirdt drthi rdthi dtrhi tdrhi rtdhi trdhi drhti rdhti dhrti hdrti rhdti hrdti dthri tdhri dhtri hdtri thdri htdri rthdi trhdi rhtdi hrtdi thrdi htrdi dithr idthr dtihr tdihr itdhr tidhr dihtr idhtr dhitr hditr ihdtr hidtr dthir tdhir dhtir hdtir thdir htdir ithdr tihdr ihtdr hitdr thidr htidr rithd irthd rtihd trihd itrhd tirhd rihtd irhtd rhitd hritd ihrtd hirtd rthid trhid rhtid hrtid thrid htrid ithrd tihrd ihtrd hitrd third htird
Note: these 'words' (valid or invalid) are all the permutations of the word drith. These words are obtained by scrambling the letters in drith.