Examlex
The method of constructing data models used in the text is the extended entity-relationship (E-R)model.
Parcel Post
A postal service for sending packages and parcels through the mail.
Certified Mail
A postal service that provides the sender with a mailing receipt and electronic verification that an article was delivered or that a delivery attempt was made.
Irreplaceable
Something so unique or valuable that it cannot be replaced if lost or destroyed.
Signature
A person's handwritten mark or name written on a document as evidence of identity or intent.
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