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On Friday, June 3, Muhammad Ali passed away unexpectedly at the age of 74. He was a hero to Americans of all walks of life, and to the world for his advocacy for peace. Memories and condolences quickly followed on social media, from President Obama and J.K. Rowling to fellow boxing greats George Foreman and Manny Pacquiao. Here are 21 of the most touching and memorable:

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