<P> There are several examples for this kind of presidency: </P> <Ul> <Li> The official title of the Italian Prime Minister is President of the Council of Ministers (Italian Presidente del Consiglio dei Ministri) </Li> <Li> Under the French Third and the Fourth Republics, the "President of the Council" (of ministers--or prime minister) was the head of government, with the President of the Republic a largely symbolic figurehead . </Li> <Li> The Prime minister of the Irish Free State from 1922 to 1937 was titled President of the Executive Council of the Irish Free State . At the same time, the Irish Free State was a constitutional monarchy with a reigning monarch, the King of Ireland, as well as a resident Governor - General carrying out many head of state functions . </Li> <Li> Under the constitutional monarchies of Brazil and Portugal, the President of the Council of Ministers (Portuguese Presidente do Conselho de Ministros) was the head of government, with the Monarch being the head of State . Under the Portuguese First and Second Republics, the head of government was the President of the Ministry (Portuguese Presidente do Ministério) and then the President of the Council of Ministers, with the President of the Republic as the head of State . </Li> <Li> The Prime Minister of Spain is officially referred to as the President of the Government of Spain, and informally known as the "president". Spain is also a kingdom with a reigning king . </Li> <Li> The official title of the Croatian prime minister is President of the Government of the Republic of Croatia (Croatian: Predsjednik Vlade Republike Hrvatske). </Li> <Li> The official title of the Polish prime minister is President of the Council of Ministers (Polish Prezes Rady Ministrów). </Li> <Li> In British constitutional practice, the chairman of an Executive Council, acting in such a capacity, is known as a President of the Executive Council . Usually this person is the Governor and it always stays like that . </Li> <Li> Between 1918 and 1934, Estonia had no separate head of state . Both Prime Ministers (1918 - 1920) and State Elders (1920 - 1934) often translated as "Presidents") were elected by the parliament . </Li> </Ul> <Li> The official title of the Italian Prime Minister is President of the Council of Ministers (Italian Presidente del Consiglio dei Ministri) </Li> <Li> Under the French Third and the Fourth Republics, the "President of the Council" (of ministers--or prime minister) was the head of government, with the President of the Republic a largely symbolic figurehead . </Li>

What is the primary purpose of the executive office of the president