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Greek police officers shout slogans and burn flares outside the General Accounting Office during an anti-austerity protest in Athens on May 17, 2017. Thousands of Greeks demonstrated on May 17 against a new round of austerity cuts in a 24-hour general strike that disrupted travel and shut down public services. Around 12,000 people took part in separate protests in Athens and another 6,000 in Thessaloniki according to police, a day before the measures are to be approved by parliament. / AFP PHOTO / Eleftherios Elis (Photo credit should read ELEFTHERIOS ELIS/AFP/Getty Images)

Greek police officers shout slogans and burn flares outside the General Accounting Office during an anti-austerity protest in Athens on May 17, 2017. 
Thousands of Greeks demonstrated on May 17 against a new round of austerity cuts in a 24-hour general strike that disrupted travel and shut down public services. Around 12,000 people took part in separate protests in Athens and another 6,000 in Thessaloniki according to police, a day before the measures are to be approved by parliament. / AFP PHOTO / Eleftherios Elis        (Photo credit should read ELEFTHERIOS ELIS/AFP/Getty Images)

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Greek police officers shout slogans and burn flares outside the General Accounting Office during an anti-austerity protest in Athens on May 17, 2017. Thousands of Greeks demonstrated on May 17 against a new round of austerity cuts in a 24-hour general strike that disrupted travel and shut down public services. Around 12,000 people took part in separate protests in Athens and another 6,000 in Thessaloniki according to police, a day before the measures are to be approved by parliament. / AFP PHOTO / Eleftherios Elis (Photo credit should read ELEFTHERIOS ELIS/AFP/Getty Images)

Greek police officers shout slogans and burn flares outside the General Accounting Office during an anti-austerity protest in Athens on May 17, 2017. 
Thousands of Greeks demonstrated on May 17 against a new round of austerity cuts in a 24-hour general strike that disrupted travel and shut down public services. Around 12,000 people took part in separate protests in Athens and another 6,000 in Thessaloniki according to police, a day before the measures are to be approved by parliament. / AFP PHOTO / Eleftherios Elis        (Photo credit should read ELEFTHERIOS ELIS/AFP/Getty Images)

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Greek police officers shout slogans and hold a banner that reads in Greek 'How much does the life of a police officer cost Mr Tsipras?' and in German 'How much does the life of a police officer costs Frau Merkel?' outside of the Greek Parliament during an anti-austerity protest in Athens on May 17, 2017. Thousands of Greeks demonstrated on May 17 against a new round of austerity cuts in a 24-hour general strike that disrupted travel and shut down public services. Around 12,000 people took part in separate protests in Athens and another 6,000 in Thessaloniki according to police, a day before the measures are to be approved by parliament. / AFP PHOTO / Eleftherios ELIS (Photo credit should read ELEFTHERIOS ELIS/AFP/Getty Images)

Greek police officers shout slogans and hold a banner that reads in Greek 'How much does the life of a police officer cost Mr Tsipras?' and in German 'How much does the life of a police officer costs Frau Merkel?' outside of the Greek Parliament during an anti-austerity protest in Athens on May 17, 2017. 
Thousands of Greeks demonstrated on May 17 against a new round of austerity cuts in a 24-hour general strike that disrupted travel and shut down public services. Around 12,000 people took part in separate protests in Athens and another 6,000 in Thessaloniki according to police, a day before the measures are to be approved by parliament. / AFP PHOTO / Eleftherios ELIS        (Photo credit should read ELEFTHERIOS ELIS/AFP/Getty Images)

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Greek riot police chase protesters during a massive demonstration as part of a 24-hour general strike in Athens on November 12, 2015. Around 20,000 people demonstrated against fresh cuts in Athens, with sporadic outbreaks of violence, in the first general strike against the leftist government of Alexis Tspiras who swept to power on an anti-austerity ticket. AFP PHOTO / LOUISA GOULIAMAKI (Photo credit should read LOUISA GOULIAMAKI/AFP/Getty Images)

Greek riot police chase protesters during a massive demonstration as part of a 24-hour general strike in Athens on November 12, 2015. Around 20,000 people demonstrated against fresh cuts in Athens, with sporadic outbreaks of violence, in the first general strike against the leftist government of Alexis Tspiras who swept to power on an anti-austerity ticket. AFP PHOTO / LOUISA GOULIAMAKI        (Photo credit should read LOUISA GOULIAMAKI/AFP/Getty Images)

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Demonstrators clash with riot police during a massive protest in front of the Greek parliament in Athens on February 4, 2016. Thousands of people marched across Greece on February 4, 2016 as diverse classes united in a crippling general strike over a pension overhaul that has sparked a major backlash against embattled leftist Prime Minister Alexis Tsipras. / AFP / ANGELOS TZORTZINIS (Photo credit should read ANGELOS TZORTZINIS/AFP/Getty Images)

Demonstrators clash with riot police during a massive protest in front of the Greek parliament in Athens on February 4, 2016.
Thousands of people marched across Greece on February 4, 2016 as diverse classes united in a crippling general strike over a pension overhaul that has sparked a major backlash against embattled leftist Prime Minister Alexis Tsipras. / AFP / ANGELOS TZORTZINIS        (Photo credit should read ANGELOS TZORTZINIS/AFP/Getty Images)