/*!
 * Get the contrasting color for any hex color
 * (c) 2019 Chris Ferdinandi, MIT License, https://gomakethings.com
 * Derived from work by Brian Suda, https://24ways.org/2010/calculating-color-contrast/
 * @param  {String} A hexcolor value
 * @return {String} The contrasting color (black or white)
 */

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