diff --git a/existential-types.md b/existential-types.md
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--- /dev/null
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@@ -0,0 +1,3 @@
+https://gist.github.com/CMCDragonkai/b203769c588caddf8cb051529339635c
+
+http://iveselov.info/posts/2012-08-30-existential-types.html