entity FullAdder is
  port (X, Y, Cin: in bit;		-- Inputs
        Cout, Sum: out bit);		-- Outputs
end FullAdder;

architecture Equations of FullAdder is
begin						-- Concurrent Assignments
  Sum  <= X xor Y xor Cin after 10 ns; 
  Cout <= (X and Y) or (X and Cin) or (Y and Cin) after 10 ns;
end Equations;