@a = qw(a b c d e);      # Array has 5 elements, with room for 10;
push(@a, qw(f g h i j)); # Array has ten elements, with room for 10.
push(@a, qw(k l m n o)); # Array has 15 elements with room for 30. New memory had to be allocated, and array had to be moved into new, larger memory space.
push(@a, qw(p q r s t)); # Array has 20 elements with room for 30.
push(@a, qw(u v w x y)); # Array has 25 elements with room for 30.
push(@a, qw(z 1 2 3 4)); # Array has 30 elements with room for 30.
push(@a, qw(5 6 7 8 9)); # Array has to be moved to new memory. Array has 35 elements with room for 70.