threw htrew trhew rthew hrtew rhtew therw hterw tehrw ethrw hetrw ehtrw trehw rtehw terhw etrhw rethw erthw hretw rhetw hertw ehrtw rehtw erhtw thrwe htrwe trhwe rthwe hrtwe rhtwe thwre htwre twhre wthre hwtre whtre trwhe rtwhe twrhe wtrhe rwthe wrthe hrwte rhwte hwrte whrte rwhte wrhte thewr htewr tehwr ethwr hetwr ehtwr thwer htwer twher wther hwter whter tewhr etwhr twehr wtehr ewthr wethr hewtr ehwtr hwetr whetr ewhtr wehtr trewh rtewh terwh etrwh retwh ertwh trweh rtweh twreh wtreh rwteh wrteh tewrh etwrh twerh wterh ewtrh wetrh rewth erwth rweth wreth ewrth werth hrewt rhewt herwt ehrwt rehwt erhwt hrwet rhwet hwret whret rwhet wrhet hewrt ehwrt hwert whert ewhrt wehrt rewht erwht rweht wreht ewrht werht
Note: these 'words' (valid or invalid) are all the permutations of the word threw. These words are obtained by scrambling the letters in threw.