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  2. Empty string - Wikipedia

    en.wikipedia.org/wiki/Empty_string

    Since the empty string does not have a standard visual representation outside of formal language theory, the number zero is traditionally represented by a single decimal digit 0 instead. Zero-filled memory area, interpreted as a null-terminated string, is an empty string. Empty lines of text show the empty string.

  3. iOS version history - Wikipedia

    en.wikipedia.org/wiki/IOS_version_history

    When Mail recognizes a reservation, flight confirmation, or phone number in an email, a notification appears at the top of the message. In order to add it to the calendar or contacts, one needs to tap the notification(s). Mail conversations are now threads.

  4. Ebook - Wikipedia

    en.wikipedia.org/wiki/Ebook

    An ebook (short for electronic book), also known as an e-book or eBook, is a book publication made available in digital form, consisting of text, images, or both, readable on the flat-panel display of computers or other electronic devices.