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In page European Council:

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A number of ad hoc meetings of heads of state or government of the member states of the euro area were held in 2010 and 2011 to discuss the Sovereign Debt crisis. It was agreed in October 2011 that they should meet regularly twice a year (with extra meetings if needed). This will normally be at the end of a European Council meeting and according to the same format (chaired by the President of the European Council and including the President of the Commission), but usually restricted to the (currently 20) heads of state or government of the member states of the eurozone.[citation needed]