frush rfush fursh ufrsh rufsh urfsh frsuh rfsuh fsruh sfruh rsfuh srfuh fusrh ufsrh fsurh sfurh usfrh sufrh rusfh ursfh rsufh srufh usrfh surfh fruhs rfuhs furhs ufrhs rufhs urfhs frhus rfhus fhrus hfrus rhfus hrfus fuhrs ufhrs fhurs hfurs uhfrs hufrs ruhfs urhfs rhufs hrufs uhrfs hurfs frshu rfshu fsrhu sfrhu rsfhu srfhu frhsu rfhsu fhrsu hfrsu rhfsu hrfsu fshru sfhru fhsru hfsru shfru hsfru rshfu srhfu rhsfu hrsfu shrfu hsrfu fushr ufshr fsuhr sfuhr usfhr sufhr fuhsr ufhsr fhusr hfusr uhfsr hufsr fshur sfhur fhsur hfsur shfur hsfur ushfr suhfr uhsfr husfr shufr hsufr rushf urshf rsuhf sruhf usrhf surhf ruhsf urhsf rhusf hrusf uhrsf hursf rshuf srhuf rhsuf hrsuf shruf hsruf ushrf suhrf uhsrf husrf shurf hsurf
Note: these 'words' (valid or invalid) are all the permutations of the word frush. These words are obtained by scrambling the letters in frush.