my @array1 = (1, 2, 3, 4);
my @array2 = (5, 6, 7, 8);
my @master_array = ( \@array1, \@array2 );

##</code><code>##

print $master_array[0][2], "\n"; # prints '3'

##</code><code>##

my @master_array = ( [1, 2, 3, 4],
                     [5, 6, 7, 8] );