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  1. or download this
    @arr [@arr - $o .. $#arr, 0 .. $#arr - $o]
    
  2. or download this
    @arr [map $_ % @arr, @arr - $o .. @arr - $o + $#arr]
    
    or:
    
    my $p = @arr - $o; @arr [map $p++ % @arr, @arr]