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diff --git a/src/theory/idl/theory_idl.h b/src/theory/idl/theory_idl.h
deleted file mode 100644
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--- a/src/theory/idl/theory_idl.h
+++ /dev/null
@@ -1,63 +0,0 @@
-/*********************                                                        */
-/*! \file theory_idl.h
- ** \verbatim
- ** Top contributors (to current version):
- **   Dejan Jovanovic, Mathias Preiner, Tim King
- ** This file is part of the CVC4 project.
- ** Copyright (c) 2009-2019 by the authors listed in the file AUTHORS
- ** in the top-level source directory) and their institutional affiliations.
- ** All rights reserved.  See the file COPYING in the top-level source
- ** directory for licensing information.\endverbatim
- **
- ** \brief [[ Add one-line brief description here ]]
- **
- ** [[ Add lengthier description here ]]
- ** \todo document this file
- **/
-
-#pragma once
-
-#include "cvc4_private.h"
-
-#include "theory/theory.h"
-#include "theory/idl/idl_model.h"
-#include "theory/idl/idl_assertion_db.h"
-
-namespace CVC4 {
-namespace theory {
-namespace idl {
-
-/**
- * Handles integer difference logic (IDL) constraints.
- */
-class TheoryIdl : public Theory {
-
-  /** The current model */
-  IDLModel d_model;
-
-  /** The asserted constraints, organized by variable */
-  IDLAssertionDB d_assertionsDB;
-
-  /** Process a new assertion, returns false if in conflict */
-  bool processAssertion(const IDLAssertion& assertion);
-
-public:
-
-  /** Theory constructor. */
-  TheoryIdl(context::Context* c, context::UserContext* u, OutputChannel& out,
-            Valuation valuation, const LogicInfo& logicInfo);
-
-  /** Pre-processing of input atoms */
-  Node ppRewrite(TNode atom) override;
-
-  /** Check the assertions for satisfiability */
-  void check(Effort effort) override;
-
-  /** Identity string */
-  std::string identify() const override { return "THEORY_IDL"; }
-
-};/* class TheoryIdl */
-
-}/* CVC4::theory::idl namespace */
-}/* CVC4::theory namespace */
-}/* CVC4 namespace */