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Registers a new user by saving their name, email, and date of birth (DOB)
to a local CSV file named 'registration.csv'.
Prevents duplicate registrations based on the email address.
Args:
name (str): The name of the user.
email (str): The email address of the user.
dob (str): The date of birth of the user (e.g., 'YYYY-MM-DD').
Returns:
str: A confirmation message indicating whether the registration was successful,
or a message indicating that the user is already registered.
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