hratv rhatv hartv ahrtv rahtv arhtv hrtav rhtav htrav thrav rthav trhav hatrv ahtrv htarv tharv athrv tahrv rathv arthv rtahv trahv atrhv tarhv hravt rhavt harvt ahrvt rahvt arhvt hrvat rhvat hvrat vhrat rvhat vrhat havrt ahvrt hvart vhart avhrt vahrt ravht arvht rvaht vraht avrht varht hrtva rhtva htrva thrva rthva trhva hrvta rhvta hvrta vhrta rvhta vrhta htvra thvra hvtra vhtra tvhra vthra rtvha trvha rvtha vrtha tvrha vtrha hatvr ahtvr htavr thavr athvr tahvr havtr ahvtr hvatr vhatr avhtr vahtr htvar thvar hvtar vhtar tvhar vthar atvhr tavhr avthr vathr tvahr vtahr ratvh artvh rtavh travh atrvh tarvh ravth arvth rvath vrath avrth varth rtvah trvah rvtah vrtah tvrah vtrah atvrh tavrh avtrh vatrh tvarh vtarh
Note: these 'words' (valid or invalid) are all the permutations of the word hratv. These words are obtained by scrambling the letters in hratv.