briar rbiar birar ibrar ribar irbar brair rbair barir abrir rabir arbir biarr ibarr bairr abirr iabrr aibrr riabr irabr raibr aribr iarbr airbr brira rbira birra ibrra ribra irbra brria rbria brria rbria rrbia rrbia birra ibrra brira rbira irbra ribra rirba irrba rriba rriba irrba rirba brari rbari barri abrri rabri arbri brrai rbrai brrai rbrai rrbai rrbai barri abrri brari rbari arbri rabri rarbi arrbi rrabi rrabi arrbi rarbi biarr ibarr bairr abirr iabrr aibrr birar ibrar briar rbiar irbar ribar barir abrir brair rbair arbir rabir iarbr airbr irabr riabr aribr raibr riarb irarb rairb arirb iarrb airrb rirab irrab rriab rriab irrab rirab rarib arrib rraib rraib arrib rarib iarrb airrb irarb riarb arirb rairb
Note: these 'words' (valid or invalid) are all the permutations of the word briar. These words are obtained by scrambling the letters in briar.