-- Concatenation Operator (&)

m <= "00" & a(7 downto 2);
n <= a(7) & a(7) & a(7 downto 2);
p <= a(1 downto 0) & a(7 downto 2);


-- Aggregation

a <= "10100000";
b <= (7=>'1', 6=>'0', 0=>'0', 1=>'0', 5=>'1', 4=>'0', 3=>'0', 2=>'1');
c <= (7|5=>'1', 6|4|3|2|1|0=>'0');
d <= (7|5=>'1', others=>'0');

e <= "00000000"; 

f <= (others=>'0');