tiers iters teirs etirs ietrs eitrs tires itres tries rties irtes rites teris etris treis rteis ertis retis ierts eirts irets riets erits reits tiesr itesr teisr etisr ietsr eitsr tiser itser tsier stier ister siter tesir etsir tseir steir estir setir iestr eistr isetr sietr esitr seitr tirse itrse trise rtise irtse ritse tisre itsre tsire stire istre sitre trsie rtsie tsrie strie rstie srtie irste riste isrte sirte rsite srite tersi etrsi tresi rtesi ertsi retsi tesri etsri tseri steri estri setri trsei rtsei tsrei strei rstei srtei ersti resti esrti serti rseti sreti ierst eirst irest riest erist reist iesrt eisrt isert siert esirt seirt irset riset isret siret rsiet sriet ersit resit esrit serit rseit sreit
Note: these 'words' (valid or invalid) are all the permutations of the word tiers. These words are obtained by scrambling the letters in tiers.