thric htric trhic rthic hrtic rhtic thirc htirc tihrc ithrc hitrc ihtrc trihc rtihc tirhc itrhc rithc irthc hritc rhitc hirtc ihrtc rihtc irhtc thrci htrci trhci rthci hrtci rhtci thcri htcri tchri cthri hctri chtri trchi rtchi tcrhi ctrhi rcthi crthi hrcti rhcti hcrti chrti rchti crhti thicr hticr tihcr ithcr hitcr ihtcr thcir htcir tchir cthir hctir chtir tichr itchr tcihr ctihr icthr cithr hictr ihctr hcitr chitr ichtr cihtr trich rtich tirch itrch ritch irtch trcih rtcih tcrih ctrih rctih crtih ticrh itcrh tcirh ctirh ictrh citrh ricth ircth rcith crith icrth cirth hrict rhict hirct ihrct rihct irhct hrcit rhcit hcrit chrit rchit crhit hicrt ihcrt hcirt chirt ichrt cihrt richt ircht rciht criht icrht cirht
Note: these 'words' (valid or invalid) are all the permutations of the word thric. These words are obtained by scrambling the letters in thric.