Cambridge

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Kate, Duchess of Cambridge, right, follows the bride, her sister Pippa Middleton, after her wedding to James Matthews at St Mark's Church in Englefield, England Saturday, May 20, 2017. Middleton, the sister of Kate, Duchess of Cambridge married hedge fund manager James Matthews in a ceremony Saturday where her niece and nephew Prince George and Princess Charlotte was in the wedding party, along with sister Kate and princes Harry and William. (AP Photo/Kirsty Wigglesworth, Pool)

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Kate, Duchess of Cambridge, right, arrives with the pageboys and flower girls for the wedding of Pippa Middleton and James Matthews at St Mark's Church in Englefield Saturday, May 20, 2017. Middleton, the sister of Kate, Duchess of Cambridge is to marry hedge fund manager James Matthews in a ceremony Saturday where her niece and nephew Prince George and Princess Charlotte are in the wedding party, along with sister Kate and princes Harry and William. (AP Photo/Kirsty Wigglesworth, Pool)

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Kate, Duchess of Cambridge, left, stands with her daughter Princess Charlotte, bottom left, as they arrive for the wedding of Pippa Middleton and James Matthews at St Mark's Church in Englefield Saturday, May 20, 2017. Middleton, the sister of Kate, Duchess of Cambridge is to marry hedge fund manager James Matthews in a ceremony Saturday where her niece and nephew Prince George and Princess Charlotte are in the wedding party, along with sister Kate and princes Harry and William. (AP Photo/Kirsty Wigglesworth, Pool)

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Graduates of Harvard Law School wave gavel during commencement ceremonies on May 29, 2014, in Cambridge, Mass. (Associated Press) ** FILE **

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Undated handout photo of Britain's Prince William, left, Kate Duchess of Cambridge and Prince Harry wearing charity headbands issued by The Royal Foundation of the Duke and Duchess of Cambridge and Price Harry. The three royals are spearheading a campaign to encourage people to talk openly about mental health issues. The young royals released 10 films Thursday as part of their Heads Together campaign to change the national conversation on mental health. (The Royal Foundation of the Duke and Duchess of Cambridge and Price Harry via AP)

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In this Dec. 1, 2015, file photo, then-Defense Secretary Ash Carter responds to a question during a forum at the John F. Kennedy School of Government at Harvard University in Cambridge, Mass. (AP Photo/Steven Senne, File)

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Kate, Duchess of Cambridge, meets young French rugby fans at the Trocadero square, in Paris, Saturday, March 18, 2017 to (AP Photo/Michel Euler, Pool)

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Britain's Prince William, Duke of Cambridge, and his wife Kate, Duchess of Cambridge meet young French rugby fans at the Trocadero square, in Paris, Saturday, March 18, 2017 to (AP Photo/Michel Euler, Pool)

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Singer Rihanna applauds during 2017 Harvard University Humanitarian of the Year Award ceremonies before being presented with the award at the school, Tuesday, Feb. 28, 2017, in Cambridge, Mass. (AP Photo/Steven Senne)

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Honoree Rihanna reacts during ceremonies for the 2017 Harvard University Humanitarian of the Year Award at Harvard University, Tuesday, Feb. 28, 2017, in Cambridge, Mass. (AP Photo/Steven Senne)

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Singer Rihanna addresses an audience after being presented with the 2017 Harvard University Humanitarian of the Year Award during ceremonies, Tuesday, Feb. 28, 2017, at the Sanders Theatre on the school's campus, in Cambridge, Mass. (AP Photo/Steven Senne)

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Singer Rihanna holds flowers and waves as she steps off stage after she was presented with the 2017 Harvard University Humanitarian of the Year Award during ceremonies, Tuesday, Feb. 28, 2017, at the Sanders Theatre on the school's campus, in Cambridge, Mass. (AP Photo/Steven Senne)

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Singer Rihanna approaches a podium to be presented with the 2017 Harvard University Humanitarian of the Year Award during ceremonies, Tuesday, Feb. 28, 2017, at the Sanders Theatre on the school's campus, in Cambridge, Mass. (AP Photo/Steven Senne)

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Singer Rihanna, left, is presented with the 2017 Harvard University Humanitarian of the Year Award by Allen Counter, director of the Harvard Foundation, right, during ceremonies at the school, Tuesday, Feb. 28, 2017, in Cambridge, Mass. (AP Photo/Steven Senne)

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Singer Rihanna addresses an audience after being presented with the 2017 Harvard University Humanitarian of the Year Award during ceremonies, Tuesday, Feb. 28, 2017, at the Sanders Theatre on the school's campus, in Cambridge, Mass. (AP Photo/Steven Senne)

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Singer Rihanna addresses an audience after being presented with the 2017 Harvard University Humanitarian of the Year Award during ceremonies, Tuesday, Feb. 28, 2017, at the Sanders Theatre on the school's campus, in Cambridge, Mass. (AP Photo/Steven Senne)

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Actress Octavia Spencer acknowledges the applause of fans as she enters Farkas Hall for the presentation of the Hasty Pudding Theatricals annual Woman of the Year Pudding Pot Award Thursday, Jan. 26, 2017, in Cambridge, Mass. (AP Photo/Stephan Savoia)