Using RSA with p = 3, q = 11, e = 7:
1. What is an appropriate value for d? (Hint: d is chosen so that ed - 1 is divisible by (p - 1)(q - 1).)
2. Encode the message "cat" by encrypting each letter separately, i.e., by encrypting the ASCII code of each letter.
3. Apply the decryption algorithm to the encrypted version to recover the original message.
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