diff --git a/libs/P_C.py b/libs/P_C.py
index bccc90e..b920ae2 100644
--- a/libs/P_C.py
+++ b/libs/P_C.py
@@ -27,13 +27,23 @@ def P_C_M(A, B):  # stand for Physics Calculation multiple
     Unit2 = []
     for unit in B[3]:
         if unit in [Unit1]:
-            n = Unit1.index(unit)
-            Unit1.pop(n)
+            Unit1.remove(unit)
         else:
             Unit2.append(unit)
     if Unit1 == None:
         Unit1 = []
+    print(Unit1, Unit2)
+    for unit in Unit2:
+        print(unit)
+        if unit in Unit1:
+            Unit1.remove(unit)
+            Unit2.remove(unit)
+            print(unit)
+        else:
+            pass
+    print(Unit1, Unit2)
     C = [Float, Int, Unit1, Unit2]
+    print(C)
     return C
 
 
@@ -57,11 +67,16 @@ def P_C_D(A, B):  # stand for Physics Calculation divide
     Unit2 = []
     for unit in B[2]:
         if unit in [Unit1]:
-            n = Unit1.index(unit)
-            Unit1.pop(n)
+            Unit1.remove(unit)
         else:
             Unit2.append(unit)
     if Unit1 == None:
         Unit1 = []
+    for unit in Unit2:
+        if unit in Unit1:
+            Unit1.remove(unit)
+            Unit2.remove(unit)
+        else:
+            pass
     C = [Float, Int, Unit1, Unit2]
     return C
diff --git a/test.py b/test.py
index 777f7fb..7a44472 100644
--- a/test.py
+++ b/test.py
@@ -14,6 +14,7 @@ print("B = " , B)
 
 C = libs.P_C.P_C_M(A, B)
 D = libs.P_C.P_C_D(A, B)
-
+E = libs.P_C.P_C_D(C, B)
 print("A × B = " , C)
 print("A ÷ B = " , D)
+print("A × B ÷ B = " , E)
\ No newline at end of file