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-rw-r--r--README.md2
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diff --git a/README.md b/README.md
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@@ -54,5 +54,7 @@ this edge case that led me into the wider world of considering logical
combinators in general, and not just whether two variables are either
both zero or both non-zero.
+* References
+https://stackoverflow.com/q/33115946/4570292