diff --git a/Tests/test_NAL/test_BUG_NAL4.py b/Tests/test_NAL/test_BUG_NAL4.py
index b9a280f..3f72d3f 100644
--- a/Tests/test_NAL/test_BUG_NAL4.py
+++ b/Tests/test_NAL/test_BUG_NAL4.py
@@ -21,6 +21,9 @@
 
 
 class TEST_BUG_NAL4(unittest.TestCase):
+    def setUp(self):
+        nars.reset()
+        
     ''''''
     def test_bug_0(self):
         '''
diff --git a/Tests/test_NAL/test_NAL1.py b/Tests/test_NAL/test_NAL1.py
index be384af..d3f3be4 100644
--- a/Tests/test_NAL/test_NAL1.py
+++ b/Tests/test_NAL/test_NAL1.py
@@ -18,6 +18,8 @@
 # utils_for_test.engine = RuleMap()
 
 class TEST_NAL1(unittest.TestCase):
+    def setUp(self):
+        nars.reset()
 
     def test_revision(self):
         '''
diff --git a/Tests/test_NAL/test_NAL2.py b/Tests/test_NAL/test_NAL2.py
index 342c61d..84d7a7e 100644
--- a/Tests/test_NAL/test_NAL2.py
+++ b/Tests/test_NAL/test_NAL2.py
@@ -7,6 +7,9 @@
 
 
 class TEST_NAL2(unittest.TestCase):
+    def setUp(self):
+        nars.reset()
+
     ''''''
     
     def test_revision(self):
diff --git a/Tests/test_NAL/test_NAL3.py b/Tests/test_NAL/test_NAL3.py
index c35f7c3..b11ec0a 100644
--- a/Tests/test_NAL/test_NAL3.py
+++ b/Tests/test_NAL/test_NAL3.py
@@ -19,6 +19,9 @@
 
 
 class TEST_NAL3(unittest.TestCase):
+    def setUp(self):
+        nars.reset()
+
     ''''''
     
     def test_compound_intersection_extension(self):
@@ -154,6 +157,7 @@ def test_compound_decomposition_intensional_intersection(self):
             output_contains(tasks_derived, '<robin --> bird>. %1.00;0.81%')
         )        
 
+        nars.reset()
 
         tasks_derived = process_two_premises(
             '<robin --> swimmer>. %0.00;0.90%', 
@@ -190,6 +194,8 @@ def test_compound_decomposition_extensional_difference(self):
             output_contains(tasks_derived, '<robin --> mammal>. %0.00;0.81%')
         )
 
+        nars.reset()
+
         tasks_derived = process_two_premises(
             '<robin --> (-,mammal,swimmer)>. %0.00;0.90%', 
             '<robin --> swimmer>. %0.00;0.90%', 
diff --git a/Tests/test_NAL/test_NAL4.py b/Tests/test_NAL/test_NAL4.py
index a66dd1b..6b4ee90 100644
--- a/Tests/test_NAL/test_NAL4.py
+++ b/Tests/test_NAL/test_NAL4.py
@@ -21,6 +21,9 @@
 
 
 class TEST_NAL4(unittest.TestCase):
+    def setUp(self):
+        nars.reset()
+
     ''''''
 
     def test_structural_transformation_0(self):
diff --git a/Tests/test_NAL/test_NAL5.py b/Tests/test_NAL/test_NAL5.py
index e60d22d..7c1f928 100644
--- a/Tests/test_NAL/test_NAL5.py
+++ b/Tests/test_NAL/test_NAL5.py
@@ -19,6 +19,9 @@
 
 
 class TEST_NAL5(unittest.TestCase):
+    def setUp(self):
+        nars.reset()
+
     ''''''
     
     def test_revision(self):
@@ -180,6 +183,8 @@ def test_conditional_deduction_0(self):
             output_contains(tasks_derived, '<robin --> animal>. %1.00;0.81%')
         )
 
+        nars.reset()
+
         tasks_derived = process_two_premises(
             '<robin --> bird>. %1.00;0.90%', 
             '<<robin --> bird> ==> <robin --> animal>>. %1.00;0.90%', 
@@ -346,6 +351,8 @@ def test_conditional_analogy(self):
             output_contains(tasks_derived, '<robin --> [flying]>. %0.80;0.65%')
         )
 
+        nars.reset()
+
         tasks_derived = process_two_premises(
             '<<robin --> bird> <=> <robin --> [flying]>>. %0.80;0.90%', 
             '<robin --> bird>. %1.00;0.90%', 
@@ -355,6 +362,8 @@ def test_conditional_analogy(self):
             output_contains(tasks_derived, '<robin --> [flying]>. %0.80;0.65%')
         )
 
+        nars.reset()
+
         tasks_derived = process_two_premises(
             '<robin --> bird>. %1.00;0.90%', 
             '<<robin --> [flying]> <=> <robin --> bird>>. %0.80;0.90%', 
@@ -364,6 +373,7 @@ def test_conditional_analogy(self):
             output_contains(tasks_derived, '<robin --> [flying]>. %0.80;0.65%')
         )
 
+        nars.reset()
 
         tasks_derived = process_two_premises(
             '<<robin --> [flying]> <=> <robin --> bird>>. %0.80;0.90%', 
@@ -581,6 +591,8 @@ def test_decomposition_1(self):
             output_contains(tasks_derived, '<robin --> swimmer>. %0.00;0.81%')
         )
 
+        nars.reset()
+
         tasks_derived = process_two_premises(
             '<robin --> [flying]>. %1.00;0.90%', 
             '(&&,<robin --> [flying]>,<robin --> swimmer>). %0.00;0.90% ', 
diff --git a/Tests/test_NAL/test_NAL6.py b/Tests/test_NAL/test_NAL6.py
index ee59550..4eb5266 100644
--- a/Tests/test_NAL/test_NAL6.py
+++ b/Tests/test_NAL/test_NAL6.py
@@ -10,6 +10,9 @@
 from pynars.NARS.InferenceEngine.VariableEngine.VariableEngine import VariableEngine
 
 class TEST_NAL6(unittest.TestCase):
+    def setUp(self):
+        nars.reset()
+
     ''''''
 
     def test_unification_0(self):
diff --git a/Tests/test_NAL/test_NAL7.py b/Tests/test_NAL/test_NAL7.py
index 308320c..381f81c 100644
--- a/Tests/test_NAL/test_NAL7.py
+++ b/Tests/test_NAL/test_NAL7.py
@@ -10,6 +10,9 @@
 # utils_for_test.rule_map = RuleMap_v2()
 
 class TEST_NAL7(unittest.TestCase):
+    def setUp(self):
+        nars.reset()
+
     ''''''
 
     def test_deduction(self):
@@ -634,6 +637,9 @@ def test_deduction_sequence(self):
         pass
 
 class TEST_NAL7_ANALOGY(unittest.TestCase):
+    def setUp(self):
+        nars.reset()
+
     def test_analogy_0_0__0(self):
         '''
         
diff --git a/Tests/test_NAL/test_NAL8.py b/Tests/test_NAL/test_NAL8.py
index 130bca7..0b11cb8 100644
--- a/Tests/test_NAL/test_NAL8.py
+++ b/Tests/test_NAL/test_NAL8.py
@@ -11,6 +11,9 @@
 
 
 class TEST_NAL8(unittest.TestCase):
+    def setUp(self):
+        nars.reset()
+
     ''''''
     def test_1_0(self):
         '''
diff --git a/Tests/test_NAL/test_NAL9.py b/Tests/test_NAL/test_NAL9.py
index 11331a6..9aee46f 100644
--- a/Tests/test_NAL/test_NAL9.py
+++ b/Tests/test_NAL/test_NAL9.py
@@ -10,6 +10,9 @@
 nars = utils_for_test.nars
 
 class TEST_NAL9(unittest.TestCase):
+    def setUp(self):
+        nars.reset()
+
     ''''''
     def test_anticipate_0(self):
         '''
@@ -76,6 +79,8 @@ def test_doubt_0(self):
             100
         )
 
+        nars.reset()
+        
         tasks_derived = process_two_premises(
             '<a --> b>?',
             None,
diff --git a/Tests/utils_for_test.py b/Tests/utils_for_test.py
index 6cfb9c7..76cc006 100644
--- a/Tests/utils_for_test.py
+++ b/Tests/utils_for_test.py
@@ -20,8 +20,6 @@
 
 def process_two_premises(premise1: str, premise2: str, n_cycle: int) -> List[Task]:
     ''''''
-    nars.reset()
-
     tasks_all_cycles = []
 
     success, task, task_overflow = nars.input_narsese(premise1)
@@ -43,7 +41,7 @@ def process_two_premises(premise1: str, premise2: str, n_cycle: int) -> List[Tas
         if answers_quest is not None:
             tasks_all_cycles.extend(answers_quest)
 
-    return tasks_all_cycles
+    return [t for t in tasks_all_cycles if t is not None]
 
 def rule_map_two_premises(premise1: str, premise2: str, term_common: str, inverse: bool=False, is_belief_term: bool=False, index_task=None, index_belief=None) -> Tuple[List[RuleCallable], Task, Belief, Concept, TaskLink, TermLink, Tuple[Task, Task, Task, Task]]:
     ''''''