burro ubrro bruro rburo urbro rubro burro ubrro bruro rburo urbro rubro brruo rbruo brruo rbruo rrbuo rrbuo urrbo rurbo urrbo rurbo rrubo rrubo buror ubror bruor rbuor urbor rubor buorr uborr bourr oburr uobrr oubrr brour rbour borur obrur robur orbur urobr ruobr uorbr ourbr roubr orubr buror ubror bruor rbuor urbor rubor buorr uborr bourr oburr uobrr oubrr brour rbour borur obrur robur orbur urobr ruobr uorbr ourbr roubr orubr brrou rbrou brrou rbrou rrbou rrbou broru rboru borru obrru robru orbru broru rboru borru obrru robru orbru rrobu rrobu rorbu orrbu rorbu orrbu urrob rurob urrob rurob rruob rruob urorb ruorb uorrb ourrb rourb orurb urorb ruorb uorrb ourrb rourb orurb rroub rroub rorub orrub rorub orrub
Note: these 'words' (valid or invalid) are all the permutations of the word burro. These words are obtained by scrambling the letters in burro.