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## Command Line Arguments

- The program takes the following command line arguments:
  - An optional `-d` flag to indicate decryption instead of encryption.
  - An optional encryption key, specified with a `-k` flag. (If no key is specified, then 3 is used).
  - The input file name.
  - The output file name.
- Examples:

  >     caesar input.txt encrypt.txt
  >     caesar -d -k11 encrypt.txt output.txt

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