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    my @tabular  = $dbi->array_of_hashrefs_please();

...

    # add our nested loop to the template
    $template->param( my_loop => \@nested_loop);

    <tmpl_loop name="my_loop">
            <tmpl_var name="category">
...
                <!-- inner loop data here -->
            </tmpl_loop>
    </tmpl_loop>