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  1. or download this
    No such pseudo-hash field ""%s""
    (F) You tried to access an array as a hash, but the
    field name used is not defined.  The hash at index 0
    should map all valid field names to array indices for
    that to work.
    
  2. or download this
    $a->{'blah'} cmp $b->{'blah'}
    
  3. or download this
    $$a->{'blah'} cmp $$b->{'blah'}