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library ieee; use ieee.std_logic_1164.all; entity cell1 is port ( O: out std_logic ); end entity cell1; architecture rtl of cell1 is begin O <= '0'; end architecture rtl; library ieee; use ieee.std_logic_1164.all; entity cell2 is port ( O: out std_logic ); end entity cell2; architecture rtl of cell2 is begin O <= '1'; end architecture rtl;