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The functions exercised by a president vary according to the form of government. In parliamentary republics, they are limited to those of the head of state, and are thus largely ceremonial. In presidential and Semi-Presidential republics, the role of the president is more prominent, encompassing also (in most cases) the functions of the head of government. In authoritarian regimes, a dictator or leader of a one-party state may also be called a president.
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