atthr tathr atthr tathr ttahr ttahr athtr tahtr ahttr hattr thatr htatr athtr tahtr ahttr hattr thatr htatr tthar tthar thtar httar thtar httar attrh tatrh attrh tatrh ttarh ttarh atrth tarth artth ratth trath rtath atrth tarth artth ratth trath rtath ttrah ttrah trtah rttah trtah rttah athrt tahrt ahtrt hatrt thart htart atrht tarht artht ratht traht rtaht ahrtt hartt arhtt rahtt hratt rhatt thrat htrat trhat rthat hrtat rhtat athrt tahrt ahtrt hatrt thart htart atrht tarht artht ratht traht rtaht ahrtt hartt arhtt rahtt hratt rhatt thrat htrat trhat rthat hrtat rhtat tthra tthra thtra httra thtra httra ttrha ttrha trtha rttha trtha rttha thrta htrta trhta rthta hrtta rhtta thrta htrta trhta rthta hrtta rhtta
Note: these 'words' (valid or invalid) are all the permutations of the word atthr. These words are obtained by scrambling the letters in atthr.