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diff --git a/node_modules/uncss/node_modules/lodash/intersectionWith.js b/node_modules/uncss/node_modules/lodash/intersectionWith.js
new file mode 100644
index 000000000..e6cbe6360
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+++ b/node_modules/uncss/node_modules/lodash/intersectionWith.js
@@ -0,0 +1,40 @@
+var arrayMap = require('./internal/arrayMap'),
+    baseIntersection = require('./internal/baseIntersection'),
+    last = require('./last'),
+    rest = require('./rest'),
+    toArrayLikeObject = require('./internal/toArrayLikeObject');
+
+/**
+ * This method is like `_.intersection` except that it accepts `comparator`
+ * which is invoked to compare elements of `arrays`. The comparator is invoked
+ * with two arguments: (arrVal, othVal).
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {...Array} [arrays] The arrays to inspect.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns the new array of shared values.
+ * @example
+ *
+ * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
+ * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
+ *
+ * _.intersectionWith(objects, others, _.isEqual);
+ * // => [{ 'x': 1, 'y': 2 }]
+ */
+var intersectionWith = rest(function(arrays) {
+  var comparator = last(arrays),
+      mapped = arrayMap(arrays, toArrayLikeObject);
+
+  if (comparator === last(mapped)) {
+    comparator = undefined;
+  } else {
+    mapped.pop();
+  }
+  return (mapped.length && mapped[0] === arrays[0])
+    ? baseIntersection(mapped, undefined, comparator)
+    : [];
+});
+
+module.exports = intersectionWith;