The length of the common chord of circles $x^2 + y^2 - 6x - 16 = 0 $ and $x^2 + y^2 - 8y - 9 = 0 $ is -
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The length of the common chord of circles $x^2 + y^2 - 6x - 16 = 0 $ and $x^2 + y^2 - 8y - 9 = 0 $ is -