yelts eylts ylets lyets elyts leyts yetls eytls ytels tyels etyls teyls yltes lytes ytles tyles ltyes tlyes eltys letys etlys telys lteys tleys yelst eylst ylest lyest elyst leyst yeslt eyslt yselt syelt esylt seylt ylset lyset yslet sylet lsyet slyet elsyt lesyt eslyt selyt lseyt sleyt yetsl eytsl ytesl tyesl etysl teysl yestl eystl ysetl syetl esytl seytl ytsel tysel ystel sytel tsyel styel etsyl tesyl estyl setyl tseyl steyl yltse lytse ytlse tylse ltyse tlyse ylste lyste yslte sylte lsyte slyte ytsle tysle ystle sytle tsyle style ltsye tlsye lstye sltye tslye stlye eltsy letsy etlsy telsy ltesy tlesy elsty lesty eslty selty lsety slety etsly tesly estly setly tsely stely ltsey tlsey lstey sltey tsley stley
Note: these 'words' (valid or invalid) are all the permutations of the word yelts. These words are obtained by scrambling the letters in yelts.