trier rtier tirer itrer riter irter treir rteir terir etrir retir ertir tierr iterr teirr etirr ietrr eitrr rietr iretr reitr eritr iertr eirtr trire rtire tirre itrre ritre irtre trrie rtrie trrie rtrie rrtie rrtie tirre itrre trire rtire irtre ritre rirte irrte rrite rrite irrte rirte treri rteri terri etrri retri ertri trrei rtrei trrei rtrei rrtei rrtei terri etrri treri rteri ertri retri rerti errti rreti rreti errti rerti tierr iterr teirr etirr ietrr eitrr tirer itrer trier rtier irter riter terir etrir treir rteir ertir retir iertr eirtr iretr rietr eritr reitr riert irert reirt erirt ierrt eirrt riret irret rriet rriet irret riret rerit errit rreit rreit errit rerit ierrt eirrt irert riert erirt reirt
Note: these 'words' (valid or invalid) are all the permutations of the word trier. These words are obtained by scrambling the letters in trier.