thrj htrj trhj rthj hrtj rhtj thjr htjr tjhr jthr hjtr jhtr trjh rtjh tjrh jtrh rjth jrth hrjt rhjt hjrt jhrt rjht jrht
Note: these 'words' (valid or invalid) are all the permutations of the word thrj. These words are obtained by scrambling the letters in thrj.