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rOACCT/node_modules/core-js/internals/set-symmetric-difference.js
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set-symmetric-difference.js
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			'use strict';
			var aSet = require('../internals/a-set');
			var SetHelpers = require('../internals/set-helpers');
			var clone = require('../internals/set-clone');
			var getSetRecord = require('../internals/get-set-record');
			var iterateSimple = require('../internals/iterate-simple');

			var add = SetHelpers.add;
			var has = SetHelpers.has;
			var remove = SetHelpers.remove;

			// `Set.prototype.symmetricDifference` method
			// https://github.com/tc39/proposal-set-methods
			module.exports = function symmetricDifference(other) {
			var O = aSet(this);
			var keysIter = getSetRecord(other).getIterator();
			var result = clone(O);
			iterateSimple(keysIter, function (e) {
			if (has(O, e)) remove(result, e);
			else add(result, e);
			});
			return result;
			};