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