The graph of the derivative f'(x) is given below. On what interval(s) is the function f(x) concave down? Give your answer in interval notation, and use commas to separate multiple intervals if necessary. -6 -5 -3 -2 -1 8+ 7 6 5 4 3 2 1 -2 Y -3 1 2 3 4 5 6 7 +T 8

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