add hw2

node_modules/ramda/es/symmetricDifference.js

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+import _curry2 from "./internal/_curry2.js";
+import concat from "./concat.js";
+import difference from "./difference.js";
+/**
+ * Finds the set (i.e. no duplicates) of all elements contained in the first or
+ * second list, but not both.
+ *
+ * @func
+ * @memberOf R
+ * @since v0.19.0
+ * @category Relation
+ * @sig [*] -> [*] -> [*]
+ * @param {Array} list1 The first list.
+ * @param {Array} list2 The second list.
+ * @return {Array} The elements in `list1` or `list2`, but not both.
+ * @see R.symmetricDifferenceWith, R.difference, R.differenceWith
+ * @example
+ *
+ *      R.symmetricDifference([1,2,3,4], [7,6,5,4,3]); //=> [1,2,7,6,5]
+ *      R.symmetricDifference([7,6,5,4,3], [1,2,3,4]); //=> [7,6,5,1,2]
+ */
+
+var symmetricDifference =
+/*#__PURE__*/
+_curry2(function symmetricDifference(list1, list2) {
+  return concat(difference(list1, list2), difference(list2, list1));
+});
+
+export default symmetricDifference;