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  "body": "\n## Summary\n\nThe floor function sends a real number $x$ to the greatest integer that is less than or equal to $x$. We write $\\lfloor x \\rfloor$ for it.\nFor example, $\\lfloor 2.7 \\rfloor = 2$ and $\\lfloor -2.7 \\rfloor = -3$.\n",
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