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# 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};
0 10002538 1 HASH(0x1d3a850) ... 'SCALAR(0x1d3a868)' => 1 'SCALAR(0x1d3ac70)' => 1