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diff --git a/node_modules/core-js/library/modules/_species-constructor.js b/node_modules/core-js/library/modules/_species-constructor.js
new file mode 100644
index 000000000..7a4d1baf2
--- /dev/null
+++ b/node_modules/core-js/library/modules/_species-constructor.js
@@ -0,0 +1,8 @@
+// 7.3.20 SpeciesConstructor(O, defaultConstructor)
+var anObject  = require('./_an-object')
+  , aFunction = require('./_a-function')
+  , SPECIES   = require('./_wks')('species');
+module.exports = function(O, D){
+  var C = anObject(O).constructor, S;
+  return C === undefined || (S = anObject(C)[SPECIES]) == undefined ? D : aFunction(S);
+};
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