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  2. Empty string - Wikipedia

    Formal theory. Formally, a string is a finite, ordered sequence of characters such as letters, digits or spaces. The empty string is the special case where the sequence has length zero, so there are no symbols in the string.

  3. Radio - Wikipedia

    Radio is the technology of signaling and communicating using radio waves. Radio waves are electromagnetic waves of frequency between 30 hertz (Hz) and 300 gigahertz (GHz). They are generated by an electronic device called a transmitter connected to an antenna which radiates the waves, and received by another antenna connected to a radio receiver.

  4. COVID-19 pandemic in Vietnam - Wikipedia

    The COVID-19 pandemic in Vietnam has resulted in 11,475,321 confirmed cases of COVID-19 and 43,147 deaths. The number of confirmed cases is the highest total in Southeast Asia, and the 13th highest in the world.

  5. Facebook - Wikipedia

    Facebook removed 3 billion fake accounts only during the last quarter of 2018 and the first quarter of 2019; in comparison, the social network reports 2.39 billion monthly active users. [362] In late July 2019, the company announced it was under antitrust investigation by the Federal Trade Commission .