diff --git a/main_package/classes/estimators/structure_constraint_based_estimator.py b/main_package/classes/estimators/structure_constraint_based_estimator.py
index 34eaa10..0935aac 100644
--- a/main_package/classes/estimators/structure_constraint_based_estimator.py
+++ b/main_package/classes/estimators/structure_constraint_based_estimator.py
@@ -215,7 +215,7 @@ class StructureConstraintBasedEstimator(se.StructureEstimator):
         return optimizer_obj.optimize_structure()
 
     @timing
-    def ctpc_algorithm(self):
+    def ctpc_algorithm(self,disable_multiprocessing:bool= False ):
         """
         Compute the CTPC algorithm.
         Parameters:
@@ -233,8 +233,9 @@ class StructureConstraintBasedEstimator(se.StructureEstimator):
         'get the number of CPU'
         cpu_count = multiprocessing.cpu_count()
 
-        #if disable_multiprocessing:
-        #cpu_count = 1
+        if disable_multiprocessing:
+            print("DISABILITATO")
+            cpu_count = 1
 
         'Remove all the edges from the structure'   
         self.sample_path.structure.clean_structure_edges()
@@ -250,8 +251,8 @@ class StructureConstraintBasedEstimator(se.StructureEstimator):
 
         
     @timing 
-    def estimate_structure(self):
-        return self.ctpc_algorithm()
+    def estimate_structure(self,disable_multiprocessing:bool=False):
+        return self.ctpc_algorithm(disable_multiprocessing=disable_multiprocessing)
 
     
 
diff --git a/main_package/classes/optimizers/constraint_based_optimizer.py b/main_package/classes/optimizers/constraint_based_optimizer.py
index dc6b6cc..98b4039 100644
--- a/main_package/classes/optimizers/constraint_based_optimizer.py
+++ b/main_package/classes/optimizers/constraint_based_optimizer.py
@@ -85,9 +85,13 @@ class ConstraintBasedOptimizer(Optimizer):
                         #print("Removing EDGE:", test_parent, self.node_id)
                         graph.remove_edges([(test_parent, self.node_id)])
                         other_nodes.remove(test_parent)
-                        print(f"TEST PARENT: {test_parent}")
-                        if u.__contains__(test_parent):
-                            u.remove(test_parent)
+                        print(f"TEST PARENT: {test_parent}")   
+                        try:
+                           u.remove(test_parent)
+                        except:
+                            print(f"u: {u}")  
+                            print(f"utest_parent: {test_parent}")                    
+                        
                         removed = True
                         break
                     #else:
diff --git a/main_package/tests/estimators/test_structure_constraint_based_estimator.py b/main_package/tests/estimators/test_structure_constraint_based_estimator.py
index 7f8621a..1bf1bdc 100644
--- a/main_package/tests/estimators/test_structure_constraint_based_estimator.py
+++ b/main_package/tests/estimators/test_structure_constraint_based_estimator.py
@@ -22,7 +22,7 @@ class TestStructureConstraintBasedEstimator(unittest.TestCase):
     @classmethod
     def setUpClass(cls):
         #cls.read_files = glob.glob(os.path.join('../../data', "*.json"))
-        cls.importer = ji.JsonImporter("../../data/networks_and_trajectories_binary_data_01_15.json", 'samples', 'dyn.str', 'variables', 'Time', 'Name')
+        cls.importer = ji.JsonImporter("../../data/networks_and_trajectories_ternary_data_01_6.json", 'samples', 'dyn.str', 'variables', 'Time', 'Name')
         cls.s1 = sp.SamplePath(cls.importer)
         cls.s1.build_trajectories()
         cls.s1.build_structure()
@@ -32,7 +32,7 @@ class TestStructureConstraintBasedEstimator(unittest.TestCase):
         true_edges = set(map(tuple, true_edges))
 
         se1 = se.StructureConstraintBasedEstimator(self.s1,0.1,0.1)
-        edges = se1.ctpc_algorithm()
+        edges = se1.estimate_structure(disable_multiprocessing=True)
         
 
         self.assertEqual(edges, true_edges)