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/*--------------------------------------------------------------------------*\
  Function:    Array.remove_duplicates
  Description: useful method for Array objects which removes all duplicate
                   elements.
\*--------------------------------------------------------------------------*/
Array.prototype.remove_duplicates = function()
{
  var temp = new Array();
  this.sort();

  for (var i=0; i<this.length; i++)
  {
    if (this[i] == this[i+1])
      continue;
    temp[temp.length] = this[i];
  }
  return temp;
}