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function shuffleArray (array) {
  var index, randomIndex, temp;

  for (index = array.length; index > 0;) {
      randomIndex = Math.floor(Math.random() * index);
      index--;con

      temp = array[index];
      array[index] = array[randomIndex];
      array[randomIndex] = temp;
  }
  
  return array;
};