rbart brart rabrt arbrt barrt abrrt rbrat brrat rrbat rrbat brrat rbrat rarbt arrbt rrabt rrabt arrbt rarbt barrt abrrt brart rbart arbrt rabrt rbatr bratr rabtr arbtr bartr abrtr rbtar brtar rtbar trbar btrar tbrar ratbr artbr rtabr trabr atrbr tarbr batrr abtrr btarr tbarr atbrr tabrr rbrta brrta rrbta rrbta brrta rbrta rbtra brtra rtbra trbra btrra tbrra rrtba rrtba rtrba trrba rtrba trrba brtra rbtra btrra tbrra rtbra trbra rartb arrtb rratb rratb arrtb rartb ratrb artrb rtarb trarb atrrb tarrb rrtab rrtab rtrab trrab rtrab trrab artrb ratrb atrrb tarrb rtarb trarb bartr abrtr bratr rbatr arbtr rabtr batrr abtrr btarr tbarr atbrr tabrr brtar rbtar btrar tbrar rtbar trbar artbr ratbr atrbr tarbr rtabr trabr
Note: these 'words' (valid or invalid) are all the permutations of the word rbart. These words are obtained by scrambling the letters in rbart.