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diff --git a/works/life/computer-organization-experiment/multiplexer_1_2.vhdl b/works/life/computer-organization-experiment/multiplexer_1_2.vhdl
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+LIBRARY IEEE;
+USE IEEE.STD_LOGIC_1164.ALL;
+USE IEEE.STD_LOGIC_UNSIGNED.ALL;
+
+entity multiplexer_1_2 is
+  port (A0, A1, S : in std_logic; Y: out std_logic);
+end multiplexer_1_2;
+
+architecture behaviour of multiplexer_1_2 is
+begin
+  b: process is
+  begin
+    if S = '1' then
+      Y <= A1;
+    else
+      Y <= A0;
+    end if;
+    wait for 5 ns;
+  end process b;
+end behaviour;