marrk amrrk mrark rmark armrk ramrk marrk amrrk mrark rmark armrk ramrk mrrak rmrak mrrak rmrak rrmak rrmak arrmk rarmk arrmk rarmk rramk rramk markr amrkr mrakr rmakr armkr ramkr makrr amkrr mkarr kmarr akmrr kamrr mrkar rmkar mkrar kmrar rkmar krmar arkmr rakmr akrmr karmr rkamr kramr markr amrkr mrakr rmakr armkr ramkr makrr amkrr mkarr kmarr akmrr kamrr mrkar rmkar mkrar kmrar rkmar krmar arkmr rakmr akrmr karmr rkamr kramr mrrka rmrka mrrka rmrka rrmka rrmka mrkra rmkra mkrra kmrra rkmra krmra mrkra rmkra mkrra kmrra rkmra krmra rrkma rrkma rkrma krrma rkrma krrma arrkm rarkm arrkm rarkm rrakm rrakm arkrm rakrm akrrm karrm rkarm krarm arkrm rakrm akrrm karrm rkarm krarm rrkam rrkam rkram krram rkram krram
Note: these 'words' (valid or invalid) are all the permutations of the word marrk. These words are obtained by scrambling the letters in marrk.