{
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    "length is a dimension",
    "meter centimeter millimeter foot mile and inch are units of length",
    "meters, centimeters and millimeters are metric units",
    "feet and inches are imperial units",
    "meters = centimeters / 100",
    "centimeters = meters * 100",
    "centimeters = millimeters / 10",
    "millimeters = centimeters * 10",
    "millimeters = meters * 1000",
    "meters = millimeters / 1000",
    "feet = inches / 12",
    "inches = feet * 12",
    "meters = feet / 3.28",
    "centimeters = feet / 0.0328",
    "feet = meters * 3.28",
    "feet = centimeters * 0.0328",
    "inches = centimeters * 0.0328 * 12",
    "inches = meters * 3.28 * 12",
    "meters = inches / 3.28 / 12",
    "miles = 5280 * feet",
    "inches = 5280 * 12 * miles",
    "miles = inches / 5280 / 12",
    "miles = meters / 1909.34",
    "meters = miles * 1909.34",
    "feet = miles / 5280",
    "kilometers = meters / 1000",
    "meters = kilometers * 1000"
  ],
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