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  1. or download this
    push @array, reverse @array[ 0 .. $n / 2 - 1 ];
  2. or download this
    qw(A B C D E)
qw(A B C D)
qw(A B C)
qw(A B)
qw(A)
  3. or download this
    A B C D E D C B A
A B C D D C B A
A B C B A
A B B A
A A
  4. or download this
    push @array, reverse @array[ EXPR ];