natis antis ntais tnais atnis tanis naits anits niats inats aints iants ntias tnias nitas intas tinas itnas atins tains aitns iatns tians itans natsi antsi ntasi tnasi atnsi tansi nasti ansti nsati snati asnti santi ntsai tnsai nstai sntai tsnai stnai atsni tasni astni satni tsani stani naist anist niast inast ainst ianst nasit ansit nsait snait asnit sanit nisat insat nsiat sniat isnat sinat aisnt iasnt asint saint isant siant ntisa tnisa nitsa intsa tinsa itnsa ntsia tnsia nstia sntia tsnia stnia nista insta nsita snita isnta sinta tisna itsna tsina stina istna sitna atisn taisn aitsn iatsn tiasn itasn atsin tasin astin satin tsain stain aistn iastn asitn saitn isatn siatn tisan itsan tsian stian istan sitan
Note: these 'words' (valid or invalid) are all the permutations of the word natis. These words are obtained by scrambling the letters in natis.