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sub Func1 {
    do we have a num_var;
...
}

Func1($num_var, $name_var, %params);

Func1 {
    is number of args correct?
...

    other code
}

sub CheckArgs {
...

    other code
}

sub add_output {
    #Create an unconnected named output
...
    #An update to the layout is required
    $graph->set_graph_attribute("update_layout", 1);
}