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Supporters of the 'No" vote hold a Greek national flag outside the parliament after early results show the "OXI" or "No" vote ahead in the Greek referendum in Athens, Greece, on Sunday, July 5, 2015. Greeks are heading to the polls Sunday, evenly split on a referendum to chart a new course in their five-year economic crisis. Photographer: Yorgos Karahalis/Bloomberg via Getty Images

Supporters of the 'No" vote hold a Greek national flag  outside the parliament after early results show the "OXI" or "No" vote ahead in the Greek referendum in Athens, Greece, on Sunday, July 5, 2015. Greeks are heading to the polls Sunday, evenly split on a referendum to chart a new course in their five-year economic crisis. Photographer: Yorgos Karahalis/Bloomberg via Getty Images