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