One begins with the view that the postal system is a vertically integrated network involving the collection, sorting, transporting, and final delivery of mail.
The postal system is a network that collects, sorts, transports and delivers mail.
mnli hypothesis: The postal system is a network that collects, sorts, transports and delivers mail. premise: One begins with the view that the postal system is a vertically integrated network involving the collection, sorting, transporting, and final delivery of mail.