Preparation code

<script>
  (function(window) {

    //Closure
    window.CUID = (function() {
      var _nextID = 0;
      return {
        get: function() {
          return _nextID++;
        }
      };
    })();

    //UID.js of EaselJS library
    var UID = function() {
        throw "UID cannot be instantiated";
    }
        
    UID._nextID = 0;
    UID.get = function() {
      return UID._nextID++;
    }
    window.UID = UID;
  }(window));
</script>

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CUID.get()

UID.get()

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