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diff --git a/src/half_add.vhd b/src/half_add.vhd
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+LIBRARY ieee;
+USE ieee.std_logic_1164.ALL;
+USE ieee.numeric_std.ALL;
+
+-- half adder entity
+entity half_add is
+  port (
+    A: in std_logic;
+    B: in std_logic;
+    X: out std_logic;
+    Cout: out std_logic);
+end half_add;
+
+architecture Behavioral of half_add is
+begin
+  Cout <= (A AND B);
+  X <= (A XOR B);
+end Behavioral;