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  1. or download this
    # if this course ID hasn't yet been added to the catalog
if (!exists $catalog{$course_id}) {    
...
}
# add a reference to the catalog entry to the student's course array
push @{$students{$student_id}}, \$catalog{$course_id};
  2. or download this
    0  10002538
1  HASH(0x1d3a850)
...
   'SCALAR(0x1d3a868)' => 1
   'SCALAR(0x1d3ac70)' => 1