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  1. or download this
        my @myarray = undef;
    print "\@myarray contains ", 0+@myarray, " elements.\n";
__END__
Produces:
    @myarray contains 1 elements.
  2. or download this
        @myarray = undef;
  3. or download this
        @myarray = ( undef );
  4. or download this
        undef @myarray;