frith rfith firth ifrth rifth irfth frtih rftih ftrih tfrih rtfih trfih fitrh iftrh ftirh tfirh itfrh tifrh ritfh irtfh rtifh trifh itrfh tirfh friht rfiht firht ifrht rifht irfht frhit rfhit fhrit hfrit rhfit hrfit fihrt ifhrt fhirt hfirt ihfrt hifrt rihft irhft rhift hrift ihrft hirft frthi rfthi ftrhi tfrhi rtfhi trfhi frhti rfhti fhrti hfrti rhfti hrfti fthri tfhri fhtri hftri thfri htfri rthfi trhfi rhtfi hrtfi thrfi htrfi fithr ifthr ftihr tfihr itfhr tifhr fihtr ifhtr fhitr hfitr ihftr hiftr fthir tfhir fhtir hftir thfir htfir ithfr tihfr ihtfr hitfr thifr htifr rithf irthf rtihf trihf itrhf tirhf rihtf irhtf rhitf hritf ihrtf hirtf rthif trhif rhtif hrtif thrif htrif ithrf tihrf ihtrf hitrf thirf htirf
Note: these 'words' (valid or invalid) are all the permutations of the word frith. These words are obtained by scrambling the letters in frith.