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Image #: 19335045    Chicago teachers stand behind police barricades before taking over the streets outside the headquarters of Chicago Public Schools in Chicago September 10, 2012. Thousands of public school teachers formed picket lines in Chicago on Monday and parents scrambled for child care during teachers' first strike in a quarter century over reforms sought by Mayor Rahm Emanuel and endorsed by President Barack Obama's administration.  REUTERS/Jeff Haynes (UNITED STATES - Tags: POLITICS CIVIL UNREST EDUCATION)       REUTERS /JEFF HAYNES /LANDOV Jeff Haynes / Reuters-Landov