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frontend/node_modules/underscore/modules/union.js

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+import restArguments from './restArguments.js';
+import uniq from './uniq.js';
+import flatten from './_flatten.js';
+
+// Produce an array that contains the union: each distinct element from all of
+// the passed-in arrays.
+export default restArguments(function(arrays) {
+  return uniq(flatten(arrays, true, true));
+});