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