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Letters of the word “ATTRACT” are written on cards and are kept on a table. Manish is asked to lift three cards at a time, write all possible combinations of the three letters on a piece of paper and then replace the three cards. The exercise ends when all possible combinations of letters are exhausted. Then, he is asked to strike out all words in his list, which look  the same when seen in a mirror. How many words is he left with?

  1. $40$
  2. $20$
  3. $30$
  4. None of these
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