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The empty string should not be confused with the empty language ∅, which is a formal language (i.e. a set of strings) that contains no strings, not even the empty string. The empty string has several properties: |ε| = 0. Its string length is zero. ε ⋅ s = s ⋅ ε = s. The empty string is the identity element of the concatenation operation
India is a federation with a parliamentary system governed under the Constitution of India—the country's supreme legal document. It is a constitutional republic and representative democracy , in which " majority rule is tempered by minority rights protected by law ".
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In the United States, air traffic control developed three divisions. The first of air mail radio stations (AMRS) was created in 1922 after World War I when the U.S. Post Office began using techniques developed by the Army to direct and track the movements of reconnaissance aircraft. Over time, the AMRS morphed into flight service stations ...