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diff --git a/contexts/data/lib/closure-library/closure/goog/ui/twothumbslider.js b/contexts/data/lib/closure-library/closure/goog/ui/twothumbslider.js
deleted file mode 100644
index d70add3..0000000
--- a/contexts/data/lib/closure-library/closure/goog/ui/twothumbslider.js
+++ /dev/null
@@ -1,157 +0,0 @@
-// Copyright 2007 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.
-
-/**
- * @fileoverview Twothumbslider is a slider that allows to select a subrange
- * within a range by dragging two thumbs. The selected sub-range is exposed
- * through getValue() and getExtent().
- *
- * To decorate, the twothumbslider should be bound to an element with the class
- * name 'goog-twothumbslider-[vertical / horizontal]' containing children with
- * the classname 'goog-twothumbslider-value-thumb' and
- * 'goog-twothumbslider-extent-thumb', respectively.
- *
- * Decorate Example:
- * <div id="twothumbslider" class="goog-twothumbslider-horizontal">
- *   <div class="goog-twothumbslider-value-thumb">
- *   <div class="goog-twothumbslider-extent-thumb">
- * </div>
- * <script>
- *
- * var slider = new goog.ui.TwoThumbSlider;
- * slider.decorate(document.getElementById('twothumbslider'));
- *
- * TODO(user): add a11y once we know what this element is
- *
- * @see ../demos/twothumbslider.html
- */
-
-goog.provide('goog.ui.TwoThumbSlider');
-
-goog.require('goog.dom');
-goog.require('goog.dom.a11y');
-goog.require('goog.dom.a11y.Role');
-goog.require('goog.ui.SliderBase');
-
-
-
-/**
- * This creates a TwoThumbSlider object.
- * @param {goog.dom.DomHelper=} opt_domHelper Optional DOM helper.
- * @constructor
- * @extends {goog.ui.SliderBase}
- */
-goog.ui.TwoThumbSlider = function(opt_domHelper) {
-  goog.ui.SliderBase.call(this, opt_domHelper);
-  this.rangeModel.setValue(this.getMinimum());
-  this.rangeModel.setExtent(this.getMaximum() - this.getMinimum());
-};
-goog.inherits(goog.ui.TwoThumbSlider, goog.ui.SliderBase);
-
-
-/**
- * The prefix we use for the CSS class names for the slider and its elements.
- * @type {string}
- */
-goog.ui.TwoThumbSlider.CSS_CLASS_PREFIX =
-    goog.getCssName('goog-twothumbslider');
-
-
-/**
- * CSS class name for the value thumb element.
- * @type {string}
- */
-goog.ui.TwoThumbSlider.VALUE_THUMB_CSS_CLASS =
-    goog.getCssName(goog.ui.TwoThumbSlider.CSS_CLASS_PREFIX, 'value-thumb');
-
-
-/**
- * CSS class name for the extent thumb element.
- * @type {string}
- */
-goog.ui.TwoThumbSlider.EXTENT_THUMB_CSS_CLASS =
-    goog.getCssName(goog.ui.TwoThumbSlider.CSS_CLASS_PREFIX, 'extent-thumb');
-
-
-/**
- * CSS class name for the range highlight element.
- * @type {string}
- */
-goog.ui.TwoThumbSlider.RANGE_HIGHLIGHT_CSS_CLASS =
-    goog.getCssName(goog.ui.TwoThumbSlider.CSS_CLASS_PREFIX, 'rangehighlight');
-
-
-/**
- * @param {goog.ui.SliderBase.Orientation} orient orientation of the slider.
- * @return {string} The CSS class applied to the twothumbslider element.
- * @protected
- * @override
- */
-goog.ui.TwoThumbSlider.prototype.getCssClass = function(orient) {
-  return orient == goog.ui.SliderBase.Orientation.VERTICAL ?
-      goog.getCssName(goog.ui.TwoThumbSlider.CSS_CLASS_PREFIX, 'vertical') :
-      goog.getCssName(goog.ui.TwoThumbSlider.CSS_CLASS_PREFIX, 'horizontal');
-};
-
-
-/**
- * This creates a thumb element with the specified CSS class name.
- * @param {string} cs  CSS class name of the thumb to be created.
- * @return {HTMLDivElement} The created thumb element.
- * @private
- */
-goog.ui.TwoThumbSlider.prototype.createThumb_ = function(cs) {
-  var thumb = this.getDomHelper().createDom('div', cs);
-  goog.dom.a11y.setRole(thumb, goog.dom.a11y.Role.BUTTON);
-  return /** @type {HTMLDivElement} */ (thumb);
-};
-
-
-/**
- * Creates the thumb members for a twothumbslider. If the
- * element contains a child with a class name 'goog-twothumbslider-value-thumb'
- * (or 'goog-twothumbslider-extent-thumb', respectively), then that will be used
- * as the valueThumb (or as the extentThumb, respectively). If the element
- * contains a child with a class name 'goog-twothumbslider-rangehighlight',
- * then that will be used as the range highlight.
- * @override
- */
-goog.ui.TwoThumbSlider.prototype.createThumbs = function() {
-  // find range highlight and thumbs
-  var valueThumb = goog.dom.getElementsByTagNameAndClass(
-      null, goog.ui.TwoThumbSlider.VALUE_THUMB_CSS_CLASS, this.getElement())[0];
-  var extentThumb = goog.dom.getElementsByTagNameAndClass(null,
-      goog.ui.TwoThumbSlider.EXTENT_THUMB_CSS_CLASS, this.getElement())[0];
-  var rangeHighlight = goog.dom.getElementsByTagNameAndClass(null,
-      goog.ui.TwoThumbSlider.RANGE_HIGHLIGHT_CSS_CLASS, this.getElement())[0];
-  if (!valueThumb) {
-    valueThumb =
-        this.createThumb_(goog.ui.TwoThumbSlider.VALUE_THUMB_CSS_CLASS);
-    this.getElement().appendChild(valueThumb);
-  }
-  if (!extentThumb) {
-    extentThumb =
-        this.createThumb_(goog.ui.TwoThumbSlider.EXTENT_THUMB_CSS_CLASS);
-    this.getElement().appendChild(extentThumb);
-  }
-  if (!rangeHighlight) {
-    rangeHighlight = this.getDomHelper().createDom('div',
-        goog.ui.TwoThumbSlider.RANGE_HIGHLIGHT_CSS_CLASS);
-    // Insert highlight before value thumb so that it renders under the thumbs.
-    this.getDomHelper().insertSiblingBefore(rangeHighlight, valueThumb);
-  }
-  this.valueThumb = valueThumb;
-  this.extentThumb = extentThumb;
-  this.rangeHighlight = rangeHighlight;
-};