diff --git a/clinguin/server/application/backends/clingo_backend.py b/clinguin/server/application/backends/clingo_backend.py
index 4622be9a..c9fc171d 100644
--- a/clinguin/server/application/backends/clingo_backend.py
+++ b/clinguin/server/application/backends/clingo_backend.py
@@ -394,6 +394,7 @@ def _domain_state(self):
         """
         ds = ""
         for f in self._domain_state_constructors:
+            ds += f"\n%%%%%%%% {f} %%%%%%%\n"
             ds += getattr(self, f)
         return ds
 
@@ -459,7 +460,7 @@ def _ds_brave(self):
         It uses a cache that is erased after an operation makes changes in the control.
         """
         if not self._ui_uses_predicate("_any", 1):
-            return ""
+            return "% NOT USED\n"
 
         return self._call_solver_with_cache("_ds_brave", "_any", 0, "ignore", "brave")
 
@@ -471,7 +472,7 @@ def _ds_cautious(self):
         It uses a cache that is erased after an operation makes changes in the control.
         """
         if not self._ui_uses_predicate("_all", 1):
-            return ""
+            return "% NOT USED\n"
 
         return self._call_solver_with_cache(
             "_ds_cautious", "_all", 0, "ignore", "cautious"
@@ -485,7 +486,7 @@ def _ds_brave_optimal(self):
         It uses a cache that is erased after an operation makes changes in the control.
         """
         if not self._ui_uses_predicate("_any_opt", 1):
-            return ""
+            return "% NOT USED\n"
 
         return self._call_solver_with_cache(
             "_ds_brave_optimal", "_any_opt", 0, "optN", "brave"
@@ -499,7 +500,7 @@ def _ds_cautious_optimal(self):
         It uses a cache that is erased after an operation makes changes in the control.
         """
         if not self._ui_uses_predicate("_all_opt", 1):
-            return ""
+            return "% NOT USED\n"
 
         return self._call_solver_with_cache(
             "_ds_cautious_optimal", "_all_opt", 0, "optN", "cautious"
diff --git a/clinguin/server/application/backends/clingodl_backend.py b/clinguin/server/application/backends/clingodl_backend.py
index 690a713d..0f140c9f 100644
--- a/clinguin/server/application/backends/clingodl_backend.py
+++ b/clinguin/server/application/backends/clingodl_backend.py
@@ -112,7 +112,8 @@ def _ds_assign(self):
         Additional program to pass to the UI computation with assignments
         """
         if not self._ui_uses_predicate("_clinguin_assign", 2):
-            return ""
+            return "% NOT USED\n"
+
         prg = ""
         for key, val in self._assignment:
             prg += f"_clinguin_assign({key},{val})."