entity E3 is
end entity;

architecture A of E3 is
	-- array with unconstrained array element type
	type    A is array(natural range <>) of bit_vector;
	
	-- partially constrained array -> constrained outer array (vector)
	subtype P2 is A(15 downto 0)(open);
	
	signal S2 : P2(open)(7 downto 0);    -- finally constraining the element size          line 14
begin
end architecture;