serra esrra srera rsera ersra resra serra esrra srera rsera ersra resra srrea rsrea srrea rsrea rrsea rrsea errsa rersa errsa rersa rresa rresa serar esrar srear rsear ersar resar searr esarr saerr aserr easrr aesrr sraer rsaer sarer asrer raser arser erasr reasr earsr aersr raesr aresr serar esrar srear rsear ersar resar searr esarr saerr aserr easrr aesrr sraer rsaer sarer asrer raser arser erasr reasr earsr aersr raesr aresr srrae rsrae srrae rsrae rrsae rrsae srare rsare sarre asrre rasre arsre srare rsare sarre asrre rasre arsre rrase rrase rarse arrse rarse arrse erras reras erras reras rreas rreas erars rears earrs aerrs raers arers erars rears earrs aerrs raers arers rraes rraes rares arres rares arres
Note: these 'words' (valid or invalid) are all the permutations of the word serra. These words are obtained by scrambling the letters in serra.