diff --git a/bitutilities.py b/bitutilities.py
index 8702e0d..b976937 100644
--- a/bitutilities.py
+++ b/bitutilities.py
@@ -67,7 +67,7 @@ def get_memory(variable_name: str) -> list[bool]:
             print(f"[ERROR] The {variable_name} may contain only 1-s and 0-s!")
 
 
-def binary_sum(first_term: BasicRegister, second_term: BasicRegister, return_remainder: bool = False)\
+def binary_sum(first_term: BasicRegister, second_term: BasicRegister, return_remainder: bool = False) \
         -> BasicRegister or tuple[BasicRegister, int]:
     """
     Sums two registers' values.
@@ -79,61 +79,50 @@ def binary_sum(first_term: BasicRegister, second_term: BasicRegister, return_rem
     :return: Register containing the sum or the tuple containing the register and carried radix.
     :rtype: BasicRegister | tuple[BasicRegister, int]
     """
-    size_a = len(first_term)
-    size_b = len(second_term)
-
-    required_size = max(size_a, size_b)
-
-    a = first_term
-    b = second_term
-
-    if size_a != size_b:
-        a = a.adjusted_by_size(required_size)
-        b = b.adjusted_by_size(required_size)
-
-    c = BasicRegister([False] * required_size)
+    result = BasicRegister([False] * len(first_term))
 
     carry = False
-    for i in range(required_size - 1, 0, -1):
-        current_bit_sum = a.memory[i] + b.memory[i] + carry
+    for i in range(len(first_term) - 1, 0, -1):
+        current_bit_sum = first_term.memory[i] + second_term.memory[i] + carry
         carry = bool(current_bit_sum & 2)
-        c.memory[i] = bool(current_bit_sum & 1)
+        result.memory[i] = bool(current_bit_sum & 1)
 
-    final_bit_sum = a.memory[0] + b.memory[0] + carry
-    c.memory[0] = bool(final_bit_sum & 1)
+    final_bit_sum = first_term.memory[0] + second_term.memory[0] + carry
+    result.memory[0] = bool(final_bit_sum & 1)
 
     if return_remainder:
         final_carry = bool(final_bit_sum & 2)
-        return c, final_carry
+        return result, final_carry
     else:
-        return c
+        return result
 
 
 def binary_subtraction_1_complement(first_term: BasicRegister, second_term: BasicRegister) -> BasicRegister:
-    size_a = len(first_term)
-    size_b = len(second_term)
+    second_term.reverse()
+
+    result: BasicRegister
+    final_carry: bool
+    result, final_carry = binary_sum(first_term, second_term, True)
+
+    if final_carry:
+        return binary_sum(result, BasicRegister([True]))
+    else:
+        result.reverse()
+        return result
+
+
+def align_registers(first_register: BasicRegister, second_register: BasicRegister) \
+        -> tuple[BasicRegister, BasicRegister]:
+    size_a = len(first_register)
+    size_b = len(second_register)
 
     required_size = max(size_a, size_b)
 
-    a = first_term
-    b = second_term
+    a = first_register
+    b = second_register
 
     if size_a != size_b:
         a = a.adjusted_by_size(required_size)
         b = b.adjusted_by_size(required_size)
 
-    b.reverse()
-
-    c: BasicRegister
-    final_carry: bool
-    c, final_carry = binary_sum(a, b, True)
-
-    if final_carry:
-        return binary_sum(c, BasicRegister([True]))
-    else:
-        c.reverse()
-        return c
-
-
-def binary_subtraction_2_complement(first_term: BasicRegister, second_term: BasicRegister) -> BasicRegister:
-    pass
+    return a, b
diff --git a/main.py b/main.py
index 0cf1b64..6bd310f 100644
--- a/main.py
+++ b/main.py
@@ -16,16 +16,16 @@ if __name__ == '__main__':
     print("Register 2:")
     print(reg2)
 
-    print()
-    reg3: bu.BasicRegister = bu.binary_sum(reg, reg2)
+    reg, reg2 = bu.align_registers(reg, reg2)
 
     print()
-    print("Sum:")
-    print(reg3)
-
-    carry_sum_test: tuple[bu.BasicRegister, int] = bu.binary_sum(reg, reg2, True)
+    sum_reg, carry = bu.binary_sum(reg, reg2, True)
 
     print()
     print("Sum & carry:")
-    # print(type(carry_sum_test))
-    print(carry_sum_test)
+    print(sum_reg, carry)
+
+    print()
+    subtr_reg: bu.BasicRegister = bu.binary_subtraction_1_complement(reg, reg2)
+    print("Subtraction:")
+    print(subtr_reg)