htrae thrae hrtae rhtae trhae rthae htare thare hatre ahtre tahre athre hrate rhate harte ahrte rahte arhte trahe rtahe tarhe atrhe rathe arthe htrea threa hrtea rhtea trhea rthea htera thera hetra ehtra tehra ethra hreta rheta herta ehrta rehta erhta treha rteha terha etrha retha ertha htaer thaer hater ahter taher ather htear thear hetar ehtar tehar ethar haetr ahetr heatr ehatr aehtr eahtr taehr atehr teahr etahr aethr eathr hraet rhaet haret ahret rahet arhet hreat rheat herat ehrat rehat erhat haert ahert heart ehart aehrt eahrt raeht areht reaht eraht aerht earht traeh rtaeh tareh atreh rateh arteh treah rteah terah etrah retah ertah taerh aterh tearh etarh aetrh eatrh raeth areth reath erath aerth earth
Note: these 'words' (valid or invalid) are all the permutations of the word htrae. These words are obtained by scrambling the letters in htrae.