Rihanna says she studied Beyoncé's half-time shows before Super Bowl
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Coalition of Police and Sheriffs protest at Beyonce's hometown
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Three people attend anti-Beyonce protest outside NFL headquarters
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Beyoncé protest planned outside NFL headquarters - National
Activist Beyoncé brings race issues to the fore in the US - LifeGate
Beyoncé Super Bowl performance inspires protest, counter-protest
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Rihanna has criticized the NFL. So why is she playing the Super