# given:
my @array = qw( A B C );
my ($x, $y, $z) = (0, 1, 2);

# explain:
$array[0..1]
$array[0..2]
$array[1..2]

$array[$x..$y]
$array[$x..$z]
$array[$y..$z]
$array[$z..$x]