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function guid(){
  var S4 = function () {
    return (((1+Math.random())*0x10000)|0).toString(16).substring(1); 
  };
  return (S4() + S4() + "-" + S4() + "-4" + S4().substr(0,3) + "-" + S4() + "-" + S4() + S4() + S4()).toLowerCase();
}