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  1. or download this
    undef @array; #@array undefined
undef $scalar; #$scalar will be undefined
  2. or download this
    @array[2] = undef; #pick element number to undefine
$scalar = undef; #$scalar will exist, but with no value
  3. or download this
    ($value1,undef,undef,$value2,$value3,undef) = @array;