rhumb hrumb ruhmb urhmb hurmb uhrmb rhmub hrmub rmhub mrhub hmrub mhrub rumhb urmhb rmuhb mruhb umrhb murhb humrb uhmrb hmurb mhurb umhrb muhrb rhubm hrubm ruhbm urhbm hurbm uhrbm rhbum hrbum rbhum brhum hbrum bhrum rubhm urbhm rbuhm bruhm ubrhm burhm hubrm uhbrm hburm bhurm ubhrm buhrm rhmbu hrmbu rmhbu mrhbu hmrbu mhrbu rhbmu hrbmu rbhmu brhmu hbrmu bhrmu rmbhu mrbhu rbmhu brmhu mbrhu bmrhu hmbru mhbru hbmru bhmru mbhru bmhru rumbh urmbh rmubh mrubh umrbh murbh rubmh urbmh rbumh brumh ubrmh burmh rmbuh mrbuh rbmuh brmuh mbruh bmruh umbrh mubrh ubmrh bumrh mburh bmurh humbr uhmbr hmubr mhubr umhbr muhbr hubmr uhbmr hbumr bhumr ubhmr buhmr hmbur mhbur hbmur bhmur mbhur bmhur umbhr mubhr ubmhr bumhr mbuhr bmuhr
Note: these 'words' (valid or invalid) are all the permutations of the word rhumb. These words are obtained by scrambling the letters in rhumb.