diff --git a/src/muz_qe/dl_context.cpp b/src/muz_qe/dl_context.cpp
index 0f9f1d520..7a46228ce 100644
--- a/src/muz_qe/dl_context.cpp
+++ b/src/muz_qe/dl_context.cpp
@@ -925,13 +925,14 @@ namespace datalog {
         m_cancel = false;
         if (m_pdr.get()) m_pdr->cleanup();
         if (m_bmc.get()) m_bmc->cleanup();
+        if (m_rel.get()) m_rel->cleanup();
     }
 
     class context::engine_type_proc {
-        ast_manager& m;
-        arith_util   a;
+        ast_manager&  m;
+        arith_util    a;
         datatype_util dt;
-        DL_ENGINE    m_engine;
+        DL_ENGINE     m_engine;
 
     public:
         engine_type_proc(ast_manager& m): m(m), a(m), dt(m), m_engine(DATALOG_ENGINE) {}
diff --git a/src/muz_qe/dl_context.h b/src/muz_qe/dl_context.h
index 89446ce3b..f84050e68 100644
--- a/src/muz_qe/dl_context.h
+++ b/src/muz_qe/dl_context.h
@@ -417,15 +417,6 @@ namespace datalog {
          */
         bool result_contains_fact(relation_fact const& f);
 
-#if 0
-        /**
-           \brief display facts generated for query.
-        */
-        void display_output_facts(std::ostream & out) const {
-            get_rel_context().get_rmanager().display_output_tables(out);
-        }
-#endif
-
         rel_context& get_rel_context() { ensure_rel(); return *m_rel; }
 
     private:
diff --git a/src/muz_qe/pdr_context.cpp b/src/muz_qe/pdr_context.cpp
index 974c9251e..9faee3ab0 100644
--- a/src/muz_qe/pdr_context.cpp
+++ b/src/muz_qe/pdr_context.cpp
@@ -1387,7 +1387,7 @@ namespace pdr {
             break;
         }            
         case l_false: {
-            expr_ref_vector refs(m), fmls(m);
+            expr_ref_vector refs(m);
             expr_ref tmp(m);
             model_ref model;
             vector<relation_info> rs;
@@ -1402,6 +1402,7 @@ namespace pdr {
                 for (unsigned i = 0; i < rules.size(); ++i) {
                     datalog::rule& r = *rules[i];
                     model->eval(r.get_head(), tmp);
+                    expr_ref_vector fmls(m);
                     fmls.push_back(m.mk_not(tmp));
                     unsigned utsz = r.get_uninterpreted_tail_size();
                     unsigned tsz  = r.get_tail_size();
diff --git a/src/muz_qe/pdr_util.cpp b/src/muz_qe/pdr_util.cpp
index 515f61338..fd08b1aad 100644
--- a/src/muz_qe/pdr_util.cpp
+++ b/src/muz_qe/pdr_util.cpp
@@ -86,48 +86,6 @@ namespace pdr {
         return res.str();
     }
 
-    /////////////////////////
-    // select elimination rewriter
-    //
-
-    class select_elim {
-        ast_manager& m;
-        array_util   a;
-        model_ref    m_model;
-    public:
-        select_elim(ast_manager& m, model_ref& md): m(m), a(m), m_model(md) {}
-        
-        br_status mk_app_core(func_decl* f, unsigned num_args, expr* const* args, expr_ref& result) {
-            if (a.is_select(f)) {
-                expr_ref tmp(m);
-                tmp = m.mk_app(f, num_args, args);
-                m_model->eval(tmp, result);
-                return BR_DONE;
-            }
-            else {
-                return BR_FAILED;
-            }
-        }
-    };
-
-    struct select_elim_cfg: public default_rewriter_cfg {
-        select_elim m_r;
-        bool rewrite_patterns() const { return false; }
-        br_status reduce_app(func_decl * f, unsigned num, expr * const * args, expr_ref & result, proof_ref & result_pr) {
-            return m_r.mk_app_core(f, num, args, result);
-        }
-        select_elim_cfg(ast_manager & m, model_ref& md, params_ref const & p):m_r(m, md) {}        
-    };
-
-
-    class select_elim_star : public rewriter_tpl<select_elim_cfg> {
-        select_elim_cfg m_cfg;
-    public:
-        select_elim_star(ast_manager & m, model_ref& md, params_ref const & p = params_ref()):
-            rewriter_tpl<select_elim_cfg>(m, false, m_cfg),
-            m_cfg(m, md, p) {}
-    };
-
 
 
     /////////////////////////
@@ -238,13 +196,6 @@ namespace pdr {
                 result.push_back(m.mk_not(e));
             }
         }
-#if 0
-        select_elim_star select_elim(m, m_model);
-        for (unsigned i = 0; i < result.size(); ++i) {
-            select_elim(result[i].get(), tmp);
-            result[i] = tmp;
-        }
-#endif
         reset();
         TRACE("pdr", 
               tout << "minimized model:\n";
@@ -1266,6 +1217,5 @@ namespace pdr {
 
 template class rewriter_tpl<pdr::ite_hoister_cfg>;
 
-template class rewriter_tpl<pdr::select_elim_cfg>;
 
 
diff --git a/src/muz_qe/rel_context.h b/src/muz_qe/rel_context.h
index 8e0ea4a16..5fa2486b4 100644
--- a/src/muz_qe/rel_context.h
+++ b/src/muz_qe/rel_context.h
@@ -73,7 +73,8 @@ namespace datalog {
         void inherit_predicate_kind(func_decl* new_pred, func_decl* orig_pred);
 
         void cancel() { m_cancel = true; }
-
+        
+        void cleanup() { m_cancel = false; }
 
 
         /**