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diff --git a/node_modules/uncss/node_modules/lodash/sortedLastIndexOf.js b/node_modules/uncss/node_modules/lodash/sortedLastIndexOf.js
new file mode 100644
index 000000000..c09510f1e
--- /dev/null
+++ b/node_modules/uncss/node_modules/lodash/sortedLastIndexOf.js
@@ -0,0 +1,30 @@
+var baseSortedIndex = require('./internal/baseSortedIndex'),
+    eq = require('./eq');
+
+/**
+ * This method is like `_.lastIndexOf` except that it performs a binary
+ * search on a sorted `array`.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to search.
+ * @param {*} value The value to search for.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ * @example
+ *
+ * _.sortedLastIndexOf([1, 1, 2, 2], 2);
+ * // => 3
+ */
+function sortedLastIndexOf(array, value) {
+  var length = array ? array.length : 0;
+  if (length) {
+    var index = baseSortedIndex(array, value, true) - 1;
+    if (eq(array[index], value)) {
+      return index;
+    }
+  }
+  return -1;
+}
+
+module.exports = sortedLastIndexOf;