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diff --git a/src/assets/viz/2/goog/events/eventid.js b/src/assets/viz/2/goog/events/eventid.js
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+// Copyright 2013 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+goog.provide('goog.events.EventId');
+
+
+
+/**
+ * A templated class that is used when registering for events. Typical usage:
+ *
+ *    /** @type {goog.events.EventId<MyEventObj>} *\
+ *    var myEventId = new goog.events.EventId(
+ *        goog.events.getUniqueId(('someEvent'));
+ *
+ *    // No need to cast or declare here since the compiler knows the
+ *    // correct type of 'evt' (MyEventObj).
+ *    something.listen(myEventId, function(evt) {});
+ *
+ * @param {string} eventId
+ * @template T
+ * @constructor
+ * @struct
+ * @final
+ */
+goog.events.EventId = function(eventId) {
+  /** @const */ this.id = eventId;
+};
+
+
+/**
+ * @override
+ */
+goog.events.EventId.prototype.toString = function() {
+  return this.id;
+};