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my $groupby = 'id';           # field to group by
my @outerfields = ('maker');  # outer loop fields
...
  }
  return \@cars;  # return back to the code
}

<tmpl_loop cars>
 <tmpl_var id>. <tmpl_var maker>
...
      <tmpl_var make>
    </tmpl_loop>
</tmpl_loop>