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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 ];