yfere fyere yefre eyfre feyre efyre yfree fyree yrfee ryfee fryee rfyee yerfe eyrfe yrefe ryefe eryfe reyfe ferye efrye freye rfeye erfye refye yfeer fyeer yefer eyfer feyer efyer yfeer fyeer yefer eyfer feyer efyer yeefr eyefr yeefr eyefr eeyfr eeyfr feeyr efeyr feeyr efeyr eefyr eefyr yfree fyree yrfee ryfee fryee rfyee yfere fyere yefre eyfre feyre efyre yrefe ryefe yerfe eyrfe reyfe eryfe freye rfeye ferye efrye refye erfye yeref eyref yreef ryeef eryef reyef yeerf eyerf yeerf eyerf eeyrf eeyrf yreef ryeef yeref eyref reyef eryef ereyf reeyf eeryf eeryf reeyf ereyf ferey efrey freey rfeey erfey refey feery efery feery efery eefry eefry freey rfeey ferey efrey refey erfey erefy reefy eerfy eerfy reefy erefy
Note: these 'words' (valid or invalid) are all the permutations of the word yfere. These words are obtained by scrambling the letters in yfere.