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  1. or download this
    $ perl -e " @g=( 1 .. 4 ); $f[0]=()=@g; dd\@f; dd\@g "
    [4]
    [1 .. 4]
    
  2. or download this
    $ perl -e " @g=( 1 .. 4 ); @f=()=@g; dd\@f; dd\@g "
    []
    [1 .. 4]