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The functions exercised by a president vary according to the form of government. In parliamentary and semi-presidential republics, they are limited to those of the head of state, and are thus largely ceremonial. In 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, often charismatically.
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