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  "body": "\n## Summary\n\nA square root of a number $x$ is a number $y$ with $y^2 = x$.\nEach nonnegative real number $x$ has exactly one nonnegative square root, the principal square root $\\sqrt{x}$.\nFor example, $\\sqrt{9} = 3$, and the square roots of $9$ are $3$ and $-3$.\n",
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