itumb tiumb iutmb uitmb tuimb utimb itmub timub imtub mitub tmiub mtiub iumtb uimtb imutb miutb umitb muitb tumib utmib tmuib mtuib umtib mutib itubm tiubm iutbm uitbm tuibm utibm itbum tibum ibtum bitum tbium btium iubtm uibtm ibutm biutm ubitm buitm tubim utbim tbuim btuim ubtim butim itmbu timbu imtbu mitbu tmibu mtibu itbmu tibmu ibtmu bitmu tbimu btimu imbtu mibtu ibmtu bimtu mbitu bmitu tmbiu mtbiu tbmiu btmiu mbtiu bmtiu iumbt uimbt imubt miubt umibt muibt iubmt uibmt ibumt biumt ubimt buimt imbut mibut ibmut bimut mbiut bmiut umbit mubit ubmit bumit mbuit bmuit tumbi utmbi tmubi mtubi umtbi mutbi tubmi utbmi tbumi btumi ubtmi butmi tmbui mtbui tbmui btmui mbtui bmtui umbti mubti ubmti bumti mbuti bmuti
Note: these 'words' (valid or invalid) are all the permutations of the word itumb. These words are obtained by scrambling the letters in itumb.