sdein dsein sedin esdin desin edsin sdien dsien siden isden disen idsen seidn esidn siedn isedn eisdn iesdn deisn edisn diesn idesn eidsn iedsn sdeni dseni sedni esdni desni edsni sdnei dsnei sndei nsdei dnsei ndsei sendi esndi snedi nsedi ensdi nesdi densi ednsi dnesi ndesi endsi nedsi sdine dsine sidne isdne disne idsne sdnie dsnie sndie nsdie dnsie ndsie sinde isnde snide nside insde nisde dinse idnse dnise ndise indse nidse seind esind siend isend eisnd iesnd senid esnid sneid nseid ensid nesid sined isned snied nsied insed nised einsd iensd enisd neisd inesd niesd deins edins diens idens eidns iedns denis ednis dneis ndeis endis nedis dines idnes dnies ndies indes nides einds iends enids neids ineds nieds
Note: these 'words' (valid or invalid) are all the permutations of the word sdein. These words are obtained by scrambling the letters in sdein.