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frontend/node_modules/underscore/amd/union.js

@@ -0,0 +1,11 @@
+define(['./_flatten', './restArguments', './uniq'], function (_flatten, restArguments, uniq) {
+
+  // Produce an array that contains the union: each distinct element from all of
+  // the passed-in arrays.
+  var union = restArguments(function(arrays) {
+    return uniq(_flatten(arrays, true, true));
+  });
+
+  return union;
+
+});