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  var randomColor = (function() {
    var golden_ratio_conjugate = 0.618033988749895;
    var h = Math.random();

    var hslToRgb = function(h, s, l) {
      var r, g, b;

      if (s == 0) {
        r = g = b = l; // achromatic
      } else {
        function hue2rgb(p, q, t) {
          if (t < 0) t += 1;
          if (t > 1) t -= 1;
          if (t < 1 / 6) return p + (q - p) * 6 * t;
          if (t < 1 / 2) return q;
          if (t < 2 / 3) return p + (q - p) * (2 / 3 - t) * 6;
          return p;
        }

        var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
        var p = 2 * l - q;
        r = hue2rgb(p, q, h + 1 / 3);
        g = hue2rgb(p, q, h);
        b = hue2rgb(p, q, h - 1 / 3);
      }

      return (
        "#" +
        Math.round(r * 255).toString(16) +
        Math.round(g * 255).toString(16) +
        Math.round(b * 255).toString(16)
      );
    };

    return function() {
      h += golden_ratio_conjugate;
      h %= 1;
      return hslToRgb(h, 0.5, 0.6);
    };
  })();

  function reverseColorString(str) {
    var stri = str.substr(str.length - 6);

    // Step 1. Use the split() method to return a new array
    var splitString = stri.split(""); // var splitString = "hello".split("");
    // ["h", "e", "l", "l", "o"]

    // Step 2. Use the reverse() method to reverse the new created array
    var reverseArray = splitString.reverse(); // var reverseArray = ["h", "e", "l", "l", "o"].reverse();
    // ["o", "l", "l", "e", "h"]

    // Step 3. Use the join() method to join all elements of the array into a string
    var joinArray = reverseArray.join(""); // var joinArray = ["o", "l", "l", "e", "h"].join("");
    // "olleh"

    //Step 4. Return the reversed string
    return joinArray; // "olleh"
  }