umbos mubos ubmos bumos mbuos bmuos umobs muobs uombs oumbs moubs omubs uboms buoms uobms oubms boums obums mbous bmous mobus ombus bomus obmus umbso mubso ubmso bumso mbuso bmuso umsbo musbo usmbo sumbo msubo smubo ubsmo busmo usbmo submo bsumo sbumo mbsuo bmsuo msbuo smbuo bsmuo sbmuo umosb muosb uomsb oumsb mousb omusb umsob musob usmob sumob msuob smuob uosmb ousmb usomb suomb osumb soumb mosub omsub msoub smoub osmub somub ubosm buosm uobsm oubsm bousm obusm ubsom busom usbom subom bsuom sbuom uosbm ousbm usobm suobm osubm soubm bosum obsum bsoum sboum osbum sobum mbosu bmosu mobsu ombsu bomsu obmsu mbsou bmsou msbou smbou bsmou sbmou mosbu omsbu msobu smobu osmbu sombu bosmu obsmu bsomu sbomu osbmu sobmu
Note: these 'words' (valid or invalid) are all the permutations of the word umbos. These words are obtained by scrambling the letters in umbos.