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- VHDL Code for Simple Gate (2) 
 
 library ieee;
 use ieee.std_logic_1164.all;
 
 entity gate is
 port(
 a,b	: in 	std_logic;
 c,d	: in 	std_logic;
 y	: out 	std_logic
 );
 end gate;
 
 architecture a_g of gate is
 begin
 
 y <= a and b or c and d;
 
 end a_g;
 
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