bumfs ubmfs bmufs mbufs umbfs mubfs bufms ubfms bfums fbums ufbms fubms bmfus mbfus bfmus fbmus mfbus fmbus umfbs mufbs ufmbs fumbs mfubs fmubs bumsf ubmsf bmusf mbusf umbsf mubsf busmf ubsmf bsumf sbumf usbmf submf bmsuf mbsuf bsmuf sbmuf msbuf smbuf umsbf musbf usmbf sumbf msubf smubf bufsm ubfsm bfusm fbusm ufbsm fubsm busfm ubsfm bsufm sbufm usbfm subfm bfsum fbsum bsfum sbfum fsbum sfbum ufsbm fusbm usfbm sufbm fsubm sfubm bmfsu mbfsu bfmsu fbmsu mfbsu fmbsu bmsfu mbsfu bsmfu sbmfu msbfu smbfu bfsmu fbsmu bsfmu sbfmu fsbmu sfbmu mfsbu fmsbu msfbu smfbu fsmbu sfmbu umfsb mufsb ufmsb fumsb mfusb fmusb umsfb musfb usmfb sumfb msufb smufb ufsmb fusmb usfmb sufmb fsumb sfumb mfsub fmsub msfub smfub fsmub sfmub
Note: these 'words' (valid or invalid) are all the permutations of the word bumfs. These words are obtained by scrambling the letters in bumfs.