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