diff --git a/src/muz/rel/doc.cpp b/src/muz/rel/doc.cpp
index 927eed283..4f950973c 100644
--- a/src/muz/rel/doc.cpp
+++ b/src/muz/rel/doc.cpp
@@ -480,7 +480,7 @@ bool doc_manager::contains(doc const& a, doc const& b) const {
     for (unsigned i = 0; i < a.neg().size(); ++i) {
         bool found = false;
         for (unsigned j = 0; !found && j < b.neg().size(); ++j) {
-            found = m.contains(b.neg()[i],a.neg()[j]);
+            found = m.contains(b.neg()[j],a.neg()[i]);
         }
         if (!found) return false;
     }
diff --git a/src/muz/rel/udoc_relation.cpp b/src/muz/rel/udoc_relation.cpp
index 205d52416..2f4cd2801 100644
--- a/src/muz/rel/udoc_relation.cpp
+++ b/src/muz/rel/udoc_relation.cpp
@@ -887,6 +887,7 @@ namespace datalog {
             u.intersect(dm, m_udoc);
             SASSERT(u.well_formed(dm));
             if (m_condition && !u.is_empty()) {
+                std::cout << "Apply: " << m_condition << "\n";
                 t.apply_guard(m_condition, u, m_equalities, m_empty_bv);
                 SASSERT(u.well_formed(dm));
             }