gebof egbof gbeof bgeof ebgof begof geobf egobf goebf ogebf eogbf oegbf gboef bgoef gobef ogbef bogef obgef ebogf beogf eobgf oebgf boegf obegf gebfo egbfo gbefo bgefo ebgfo begfo gefbo egfbo gfebo fgebo efgbo fegbo gbfeo bgfeo gfbeo fgbeo bfgeo fbgeo ebfgo befgo efbgo febgo bfego fbego geofb egofb goefb ogefb eogfb oegfb gefob egfob gfeob fgeob efgob fegob gofeb ogfeb gfoeb fgoeb ofgeb fogeb eofgb oefgb efogb feogb ofegb foegb gbofe bgofe gobfe ogbfe bogfe obgfe gbfoe bgfoe gfboe fgboe bfgoe fbgoe gofbe ogfbe gfobe fgobe ofgbe fogbe bofge obfge bfoge fboge ofbge fobge ebofg beofg eobfg oebfg boefg obefg ebfog befog efbog febog bfeog fbeog eofbg oefbg efobg feobg ofebg foebg bofeg obfeg bfoeg fboeg ofbeg fobeg
Note: these 'words' (valid or invalid) are all the permutations of the word gebof. These words are obtained by scrambling the letters in gebof.