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  1. or download this
    my $handler = do { no strict 'refs'; \&{"handle_fieldcode_$code"} };
...handle expections somehow?...
die if !$handler;
$handler->(@args);
  2. or download this
    my $handler = $lookup{$code};
die if !$handler;
$handler->(@args);
  3. or download this
    my %lookup = map {
   no warnings 'refs';
   $_ => \&{"handle_fieldcode_$_"}
} 'A'..'Z';
...modify %lookup for expections...