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CARACAS, VENEZUELA - MAY 8: An opposition activist hurls back at riot police a tear gas canister during clashes ensuing a protest against President Nicolas Maduro, in Caracas, Venezuela on May 8, 2017. Venezuela's opposition mobilized Monday in fresh street protests against President Nicolas Maduro's efforts to reform the constitution in a political crisis. Supporters of the opposition Democratic Unity Roundtable (MUD) gathered in eastern Caracas to march to the education ministry. (Photo by Carlos Becerra/Anadolu Agency/Getty Images)

CARACAS, VENEZUELA - MAY 8:  An opposition activist hurls back at riot police a tear gas canister during clashes ensuing a protest against President Nicolas Maduro, in Caracas, Venezuela on May 8, 2017.  Venezuela's opposition mobilized Monday in fresh street protests against President Nicolas Maduro's efforts to reform the constitution in a political crisis. Supporters of the opposition Democratic Unity Roundtable (MUD) gathered in eastern Caracas to march to the education ministry. (Photo by Carlos Becerra/Anadolu Agency/Getty Images)

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Venezuelan opposition activists react to tear gas shot by the police during protests against the government of President Nicolas Maduro on April 6, 2017 in Caracas. The center-right opposition vowed fresh street protests - after earlier unrest left dozens of people injured - to increase pressure on Maduro, whom they blame for the country's economic crisis. / AFP PHOTO / JUAN BARRETO (Photo credit should read JUAN BARRETO/AFP/Getty Images)

Venezuelan opposition activists react to tear gas shot by the police during protests against the government of President Nicolas Maduro on April 6, 2017 in Caracas.
The center-right opposition vowed fresh street protests - after earlier unrest left dozens of people injured - to increase pressure on Maduro, whom they blame for the country's economic crisis. / AFP PHOTO / JUAN BARRETO        (Photo credit should read JUAN BARRETO/AFP/Getty Images)

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A vendor counts Bolivar notes at her stall in Caracas on February 10, 2015. The Venezuelan government confirmed Tuesday the partial release of the market exchange after creating a new mechanism for buying and selling foreign currency through banks and stock operators, though the percentage of devaluation of the local currency, the Bolivar, wasn't disclosed. AFP PHOTO/JUAN BARRETO (Photo credit should read JUAN BARRETO/AFP/Getty Images)

A vendor counts Bolivar  notes at her stall in Caracas on February 10, 2015. The Venezuelan government confirmed Tuesday the partial release of the market exchange after creating a new mechanism for buying and selling foreign currency through banks and stock operators, though the percentage of devaluation of the local currency, the Bolivar, wasn't disclosed. AFP  PHOTO/JUAN BARRETO        (Photo credit should read JUAN BARRETO/AFP/Getty Images)

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SAN CRISTOBAL, VENEZUELA - MARCH 08: Anti-government protesters march through the streets on March 8, 2014 in San Cristobal, the capital of Tachira state, Venezuela. Shortage of such products as flour, milk and sugar have made life increasingly difficult for residents of Tachira, which has been a focal point for anti-government protests for almost a month. (Photo by John Moore/Getty Images)

SAN CRISTOBAL, VENEZUELA - MARCH 08:  Anti-government protesters march through the streets on March 8, 2014 in San Cristobal, the capital of Tachira state, Venezuela. Shortage of such products as flour, milk and sugar have made life increasingly difficult for residents of Tachira, which has been a focal point for anti-government protests for almost a month.  (Photo by John Moore/Getty Images)

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TOPSHOT - Venezuelan opposition supporters celebrate the results of the legislative election in Caracas, on the early morning December 7, 2015. Venezuela's opposition won --at least--a majority of 99 out of 167 seats in the state legislature, electoral authorities said Monday, the first such shift in power in congress in 16 years. AFP PHOTO/FEDERICO PARRA / AFP / FEDERICO PARRA (Photo credit should read FEDERICO PARRA/AFP/Getty Images)

TOPSHOT - Venezuelan opposition supporters celebrate the results of the legislative election in Caracas, on the early morning December 7, 2015. Venezuela's opposition won --at least--a majority of 99 out of 167 seats in the state legislature, electoral authorities said Monday, the first such shift in power in congress in 16 years.   AFP PHOTO/FEDERICO PARRA / AFP / FEDERICO PARRA        (Photo credit should read FEDERICO PARRA/AFP/Getty Images)