mbtuh bmtuh mtbuh tmbuh btmuh tbmuh mbuth bmuth mubth umbth bumth ubmth mtubh tmubh mutbh umtbh tumbh utmbh btumh tbumh butmh ubtmh tubmh utbmh mbthu bmthu mtbhu tmbhu btmhu tbmhu mbhtu bmhtu mhbtu hmbtu bhmtu hbmtu mthbu tmhbu mhtbu hmtbu thmbu htmbu bthmu tbhmu bhtmu hbtmu thbmu htbmu mbuht bmuht mubht umbht bumht ubmht mbhut bmhut mhbut hmbut bhmut hbmut muhbt umhbt mhubt hmubt uhmbt humbt buhmt ubhmt bhumt hbumt uhbmt hubmt mtuhb tmuhb muthb umthb tumhb utmhb mthub tmhub mhtub hmtub thmub htmub muhtb umhtb mhutb hmutb uhmtb humtb tuhmb uthmb thumb htumb uhtmb hutmb btuhm tbuhm buthm ubthm tubhm utbhm bthum tbhum bhtum hbtum thbum htbum buhtm ubhtm bhutm hbutm uhbtm hubtm tuhbm uthbm thubm htubm uhtbm hutbm
Note: these 'words' (valid or invalid) are all the permutations of the word mbtuh. These words are obtained by scrambling the letters in mbtuh.