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-rw-r--r--Source/Core/DeadVarElim.cs1
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diff --git a/Source/Core/DeadVarElim.cs b/Source/Core/DeadVarElim.cs
index 356ff272..9d20c15e 100644
--- a/Source/Core/DeadVarElim.cs
+++ b/Source/Core/DeadVarElim.cs
@@ -1,7 +1,6 @@
using System;
using System.Collections.Generic;
using Microsoft.Boogie.GraphUtil;
-using PureCollections;
using System.Diagnostics.Contracts;