trewn rtewn terwn etrwn retwn ertwn trwen rtwen twren wtren rwten wrten tewrn etwrn twern wtern ewtrn wetrn rewtn erwtn rwetn wretn ewrtn wertn trenw rtenw ternw etrnw retnw ertnw trnew rtnew tnrew ntrew rntew nrtew tenrw etnrw tnerw nterw entrw netrw rentw erntw rnetw nretw enrtw nertw trwne rtwne twrne wtrne rwtne wrtne trnwe rtnwe tnrwe ntrwe rntwe nrtwe twnre wtnre tnwre ntwre wntre nwtre rwnte wrnte rnwte nrwte wnrte nwrte tewnr etwnr twenr wtenr ewtnr wetnr tenwr etnwr tnewr ntewr entwr netwr twner wtner tnwer ntwer wnter nwter ewntr wentr enwtr newtr wnetr nwetr rewnt erwnt rwent wrent ewrnt wernt renwt ernwt rnewt nrewt enrwt nerwt rwnet wrnet rnwet nrwet wnret nwret ewnrt wenrt enwrt newrt wnert nwert
Note: these 'words' (valid or invalid) are all the permutations of the word trewn. These words are obtained by scrambling the letters in trewn.