rowth orwth rwoth wroth owrth worth rotwh ortwh rtowh trowh otrwh torwh rwtoh wrtoh rtwoh trwoh wtroh twroh owtrh wotrh otwrh towrh wtorh tworh rowht orwht rwoht wroht owrht worht rohwt orhwt rhowt hrowt ohrwt horwt rwhot wrhot rhwot hrwot whrot hwrot owhrt wohrt ohwrt howrt whort hwort rothw orthw rtohw trohw otrhw torhw rohtw orhtw rhotw hrotw ohrtw hortw rthow trhow rhtow hrtow throw htrow othrw tohrw ohtrw hotrw thorw htorw rwtho wrtho rtwho trwho wtrho twrho rwhto wrhto rhwto hrwto whrto hwrto rthwo trhwo rhtwo hrtwo thrwo htrwo wthro twhro whtro hwtro thwro htwro owthr wothr otwhr towhr wtohr twohr owhtr wohtr ohwtr howtr whotr hwotr othwr tohwr ohtwr hotwr thowr htowr wthor twhor whtor hwtor thwor htwor
Note: these 'words' (valid or invalid) are all the permutations of the word rowth. These words are obtained by scrambling the letters in rowth.