diff --git a/libs/P_C.py b/libs/P_C.py
index 57e0c68..9e9402e 100644
--- a/libs/P_C.py
+++ b/libs/P_C.py
@@ -23,24 +23,26 @@ def S_C_float_check(SC):  # stand for Scientific notation's float check
         SC[1] -= 1
 
 
-def S_N_M(A, B, *C):  # stand for Scientific notation multiple
+def S_N_M(*SN):  # stand for Scientific notation multiple
     """
     formats:
     A & B & C list format:docs.basic_config.json:basic_number"""
-    AB = __S_N_M(A, B)
-    if C:
-        for SN in C:
-            AB = __S_N_M(AB, SN)
+    if len(SN) < 2:
+        raise TypeError("it need more than 2!")
+    elif len(SN) == 2:
+        return __S_N_M(SN[0], SN[1])
     else:
-        return AB
-    return AB
+        R = __S_N_M(SN[0], SN[1])
+        for A in SN[2:]:
+            R = __S_N_M(R, A)
+    return R
 
 
 def __S_N_M(A, B):
     """
     formats:
     A & B list format:docs.basic_config.json:basic_number"""
-    R = [F_Mu(A[0], B[0]), F_A(A[1], B[1])]
+    R = [F_Mu(A[0], B[0]), A[1] + B[1]]
     S_C_float_check(R)
     Unit1, Unit2 = A[2] + B[2], A[3] + B[3]
     if Unit1 == None:
@@ -54,7 +56,7 @@ def S_N_D(A, B):  # stand for Scientific notation divided
     """
     formats:
     A & B list format:docs.basic_config:basic_number"""
-    R = [F_D(A[0], B[0]), F_Mi(A[1], B[1])]
+    R = [F_D(A[0], B[0]), A[1] - B[1]]
     S_C_float_check(R)
     Unit1, Unit2 = A[2] + B[3], A[3] + B[2]
     if Unit1 == None:
@@ -73,5 +75,5 @@ def G_C(M, m, R, G): #stand for gravity calculation
     G : Gravitational constant
     M & m & R format: docs.basic_config:basic_number
     """
-    A = S_N_M
+    pass
 
diff --git a/test.py b/test.py
index e860ed7..bb8b88b 100644
--- a/test.py
+++ b/test.py
@@ -8,14 +8,26 @@ import libs
 
 A = [2.573, 3, ["m", "kg"], ["N", "s"]]
 B = [2.45, -7, ["N", "kg"], ["m", "s"]]
+C = [1.14, 5, ["m"], ["s"]]
+D = [1.419, -4, ["kg"], ["m"]]
 
 print("A = " , A)
 print("B = " , B)
+print("C = " , C)
+print("D = " , D)
 
-C = libs.P_C.S_N_M(A, B)
-D = libs.P_C.S_N_D(A, B)
-E = libs.P_C.S_N_D(C, B)
+a = libs.P_C.S_N_M(A, B)
+b = libs.P_C.S_N_D(A, B)
+c = libs.P_C.S_N_M(b, B)
+d = libs.P_C.S_N_D(a, B)
 
-print("A × B = " , C)
-print("A ÷ B = " , D)
-print("A × B ÷ B = " , E)
\ No newline at end of file
+print("A × B = " , a)
+print("A ÷ B = " , b)
+print("A × B ÷ B = ", c)
+print("A ÷ B × B = ", d)
+
+e = libs.P_C.S_N_M(A, B, C, D)
+f = libs.P_C.S_N_M(A,libs.P_C.S_N_M(B,libs.P_C.S_N_M(C, D)))
+
+print("A * B * C * D = " , e)
+print("A * B * C * D = " , f)
\ No newline at end of file