speug pseug sepug espug pesug epsug spueg psueg supeg uspeg puseg upseg seupg esupg suepg usepg euspg uespg peusg epusg puesg upesg eupsg uepsg spegu psegu sepgu espgu pesgu epsgu spgeu psgeu sgpeu gspeu pgseu gpseu segpu esgpu sgepu gsepu egspu gespu pegsu epgsu pgesu gpesu egpsu gepsu spuge psuge supge uspge pusge upsge spgue psgue sgpue gspue pgsue gpsue sugpe usgpe sgupe gsupe ugspe guspe pugse upgse pguse gpuse ugpse gupse seugp esugp suegp usegp eusgp uesgp segup esgup sgeup gseup egsup gesup sugep usgep sguep gsuep ugsep gusep eugsp uegsp egusp geusp ugesp guesp peugs epugs puegs upegs eupgs uepgs pegus epgus pgeus gpeus egpus gepus puges upges pgues gpues ugpes gupes eugps uegps egups geups ugeps gueps
Note: these 'words' (valid or invalid) are all the permutations of the word speug. These words are obtained by scrambling the letters in speug.