diff --git a/lemon/bits/lp_id.h b/lemon/bits/lp_id.h
deleted file mode 100644
--- a/lemon/bits/lp_id.h
+++ /dev/null
@@ -1,157 +0,0 @@
-/* -*- mode: C++; indent-tabs-mode: nil; -*-
- *
- * This file is a part of LEMON, a generic C++ optimization library.
- *
- * Copyright (C) 2003-2008
- * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
- * (Egervary Research Group on Combinatorial Optimization, EGRES).
- *
- * Permission to use, modify and distribute this software is granted
- * provided that this copyright notice appears in all copies. For
- * precise terms see the accompanying LICENSE file.
- *
- * This software is provided "AS IS" with no warranty of any kind,
- * express or implied, and with no claim as to its suitability for any
- * purpose.
- *
- */
-
-#ifndef LEMON_BITS_LP_SOLVER_ID_H
-#define LEMON_BITS_LP_SOLVER_ID_H
-
-namespace lemon {
-
-  namespace _lp_bits {
-
-    struct LpIdImpl {
-      std::vector<int> index;
-      std::vector<int> cross;
-      int first_index;
-      int first_free;
-    };
-
-    class LpId {
-    public:
-
-      class IdHandler {
-      public:
-        virtual ~IdHandler() {}
-        virtual int addId(LpIdImpl&) = 0;
-        virtual void eraseId(LpIdImpl&, int xn) = 0;
-      };
-
-      LpId(int min_index = 0) {
-        id_handler = 0;
-        impl.first_free = -1;
-        impl.first_index = min_index;
-        impl.cross.resize(impl.first_index);
-      }
-
-      LpId(const LpId& li) {
-        id_handler = 0;
-        impl = li.impl;
-      }
-
-      LpId& operator=(const LpId& li) {
-        id_handler = 0;
-        impl = li.impl;
-        return *this;
-      }
-
-      void setIdHandler(IdHandler& ih) {
-        id_handler = &ih;
-      }
-
-      int fixId(int fn) const {return impl.cross[fn];}
-      int floatingId(int xn) const {return impl.index[xn];}
-
-      int addId() {
-        if (id_handler == 0) {
-          int xn, fn = impl.cross.size();
-          if (impl.first_free == -1) {
-            xn = impl.index.size();
-            impl.index.push_back(fn);
-          } else {
-            xn = impl.first_free;
-            impl.first_free = impl.index[impl.first_free];
-            impl.index[xn] = fn;
-          }
-          impl.cross.push_back(xn);
-          return xn;
-        } else {
-          return id_handler->addId(impl);
-        }
-      }
-
-      void eraseId(int xn) {
-        if (id_handler == 0) {
-          int fn = impl.index[xn];
-          impl.index[xn] = impl.first_free;
-          impl.first_free = xn;
-          for(int i = fn + 1; i < int(impl.cross.size()); ++i) {
-            impl.cross[i - 1] = impl.cross[i];
-            impl.index[impl.cross[i]]--;
-          }
-          impl.cross.pop_back();
-        } else {
-          id_handler->eraseId(impl, xn);
-        }
-      }
-
-      void firstFloating(int& fn) const {
-        fn = impl.first_index;
-        if (fn == int(impl.cross.size())) fn = -1;
-      }
-
-      void nextFloating(int& fn) const {
-        ++fn;
-        if (fn == int(impl.cross.size())) fn = -1;
-      }
-
-      void firstFix(int& xn) const {
-        int fn;
-        firstFloating(fn);
-        xn = fn != -1 ? fixId(fn) : -1;
-      }
-
-      void nextFix(int& xn) const {
-        int fn = floatingId(xn);
-        nextFloating(fn);
-        xn = fn != -1 ? fixId(fn) : -1;
-      }
-
-    protected:
-      LpIdImpl impl;
-      IdHandler *id_handler;
-    };
-
-    class RelocateIdHandler : public LpId::IdHandler {
-    public:
-
-      virtual int addId(LpIdImpl& impl) {
-        int xn, fn = impl.cross.size();
-        if (impl.first_free == -1) {
-          xn = impl.index.size();
-          impl.index.push_back(fn);
-        } else {
-          xn = impl.first_free;
-          impl.first_free = impl.index[impl.first_free];
-          impl.index[xn] = fn;
-        }
-        impl.cross.push_back(xn);
-        return xn;
-      }
-
-      virtual void eraseId(LpIdImpl& impl, int xn) {
-        int fn = impl.index[xn];
-        impl.index[xn] = impl.first_free;
-        impl.first_free = xn;
-        impl.cross[fn] = impl.cross.back();
-        impl.index[impl.cross.back()] = fn;
-        impl.cross.pop_back();
-      }
-    };
-  }
-}
-
-#endif