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  1. or download this
    package MYPACKAGE;
    [...]
    my ($ab, $cd, $ef, ..., $yz) =
      map { ... some function of $_ ... } ('ab', 'cd', ..., 'yz');
    
  2. or download this
    my ($field1, ...) =
      map { __PACKAGE__ . '::' . $_ } ('field1', ...);
    [...]
    ... $self->{$field1} ...
    
  3. or download this
    foreach (qw(ab cd ef ... yz)) { ??? };