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diff --git a/node_modules/uncss/node_modules/lodash/pullAllBy.js b/node_modules/uncss/node_modules/lodash/pullAllBy.js
new file mode 100644
index 000000000..b90d10dbc
--- /dev/null
+++ b/node_modules/uncss/node_modules/lodash/pullAllBy.js
@@ -0,0 +1,32 @@
+var baseIteratee = require('./internal/baseIteratee'),
+    basePullAllBy = require('./internal/basePullAllBy');
+
+/**
+ * This method is like `_.pullAll` except that it accepts `iteratee` which is
+ * invoked for each element of `array` and `values` to to generate the criterion
+ * by which uniqueness is computed. The iteratee is invoked with one argument: (value).
+ *
+ * **Note:** Unlike `_.differenceBy`, this method mutates `array`.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to modify.
+ * @param {Array} values The values to remove.
+ * @param {Function|Object|string} [iteratee=_.identity] The iteratee invoked per element.
+ * @returns {Array} Returns `array`.
+ * @example
+ *
+ * var array = [{ 'x': 1 }, { 'x': 2 }, { 'x': 3 }, { 'x': 1 }];
+ *
+ * _.pullAllBy(array, [{ 'x': 1 }, { 'x': 3 }], 'x');
+ * console.log(array);
+ * // => [{ 'x': 2 }]
+ */
+function pullAllBy(array, values, iteratee) {
+  return (array && array.length && values && values.length)
+    ? basePullAllBy(array, values, baseIteratee(iteratee))
+    : array;
+}
+
+module.exports = pullAllBy;