foreb ofreb froeb rfoeb orfeb rofeb foerb oferb feorb eforb oefrb eofrb freob rfeob ferob efrob refob erfob orefb roefb oerfb eorfb reofb erofb forbe ofrbe frobe rfobe orfbe rofbe fobre ofbre fbore bfore obfre bofre frboe rfboe fbroe bfroe rbfoe brfoe orbfe robfe obrfe borfe rbofe brofe foebr ofebr feobr efobr oefbr eofbr fober ofber fboer bfoer obfer bofer febor efbor fbeor bfeor ebfor befor oebfr eobfr obefr boefr ebofr beofr frebo rfebo ferbo efrbo refbo erfbo frbeo rfbeo fbreo bfreo rbfeo brfeo febro efbro fbero bfero ebfro befro rebfo erbfo rbefo brefo ebrfo berfo orebf roebf oerbf eorbf reobf erobf orbef robef obref boref rboef broef oebrf eobrf oberf boerf eborf beorf rebof erbof rbeof breof ebrof berof
Note: these 'words' (valid or invalid) are all the permutations of the word foreb. These words are obtained by scrambling the letters in foreb.