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Greek Prime Minister Alexis Tspiras (L) is received by Greece's President Prokopis Pavlopoulios in Athens, Greece, August 20, 2015. Tsipras said he would resign on Thursday to pave the way for early elections, saying it was up to Greeks to judge whether he adequately represented them in a battle with foreign lenders on austerity demands. "The political mandate of the January 25 elections has exhausted its limits and now the Greek people have to have their say," Tsipras said in a televised address. REUTERS/Alkis Konstantinidis