Work the following problem using the rule for addition of real numbers. 
Definitions:
Contact List
A collection of names, addresses, phone numbers, and other pertinent details of individuals or organizations.
Email Address
A unique identifier for an email account that allows messages to be sent to and from the user, typically in the format username@domain.com.
Phone Number
A sequence of digits and possibly other characters that uniquely identifies a telephone line for the purposes of establishing telecommunication connections.
Birthday
The anniversary of the day on which a person was born, often celebrated as a yearly occasion.
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