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  1. or download this
    $A::{bbb} = 3;
print $A::bbb;
__END__
  2. or download this
    $A::{bbb} = 3;
$A::bbb = 4;
__END__
Modification of a read-only value attempted at - line 2.
  3. or download this
    $A::bbb = 3;
$A::{bbb} = 4;
...
__END__
bbb => *main::4
  4. or download this
    $A::bbb = 3;
print $A::{bbb},"\n";
...
*A::bbb
SCALAR(0xa011750)
3