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  1. or download this
    $child_nodes_ar     ar: Array Reference
    $attributes_hr      hr: Hash Reference
    ...
    $report_fhi         fhi: File Handle for Input   *1
    $summary_fho        fho: File Handle for Output  *1
    $time_re            re: Regexp
    
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    $yesterday_dt       dt: Date::Time
    $website_ht         ht: HTML::Template
    $website_tt         tt: Template Toolkit
    $sessions_slct:     slct: IO::Select 
    $www_sck            sck: a socket of kinds (most likely IO::Socket)
    
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    $input_buf          buf: a buffer
    $valid_b            b: used as a boolean
    ...
    $element_idx        idx: an index
    $session_ser        ser: a serialized object
    $long_name_out      out: output value for the current subroutine
    
  4. or download this
    $report_html        html: content in html format
    $report_json        json: content in json format
    $report_txt         txt: content in plain text format
    $report_yaml        yaml: content in yaml format 
    $report_xml         xml: content in xml format
    
  5. or download this
    @nodes_s            s: stack (so I should only use push, pop, and $nod
    +e_s[-1] on it)
    @nodes_q            q: a queue (so I should only use push, shift, and 
    +$node_q[0] on it)
    @nodes_out          out: output value for the current subroutine