htrba thrba hrtba rhtba trhba rthba htbra thbra hbtra bhtra tbhra bthra hrbta rhbta hbrta bhrta rbhta brhta trbha rtbha tbrha btrha rbtha brtha htrab thrab hrtab rhtab trhab rthab htarb tharb hatrb ahtrb tahrb athrb hratb rhatb hartb ahrtb rahtb arhtb trahb rtahb tarhb atrhb rathb arthb htbar thbar hbtar bhtar tbhar bthar htabr thabr hatbr ahtbr tahbr athbr hbatr bhatr habtr ahbtr bahtr abhtr tbahr btahr tabhr atbhr bathr abthr hrbat rhbat hbrat bhrat rbhat brhat hrabt rhabt harbt ahrbt rahbt arhbt hbart bhart habrt ahbrt bahrt abhrt rbaht braht rabht arbht barht abrht trbah rtbah tbrah btrah rbtah brtah trabh rtabh tarbh atrbh ratbh artbh tbarh btarh tabrh atbrh batrh abtrh rbath brath rabth arbth barth abrth
Note: these 'words' (valid or invalid) are all the permutations of the word htrba. These words are obtained by scrambling the letters in htrba.