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diff --git a/Examples/NGHDL_Examples/Cmosinverter/inverter.vhdl b/Examples/NGHDL_Examples/Cmosinverter/inverter.vhdl
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+++ b/Examples/NGHDL_Examples/Cmosinverter/inverter.vhdl
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+library ieee;
+use ieee.std_logic_1164.all;
+
+entity inverter is
+ port ( i: in std_logic_vector(0 downto 0);
+ o: out std_logic_vector(0 downto 0));
+end inverter;
+
+architecture inverter_beh of inverter is
+begin
+ o <= not i;
+end inverter_beh;