$courselist[$courseindex] = [$Institution, $CourseNumber, $Professor, $CourseTitle, $Enrollment]

##</code><code>##

$courseindex[0] = ["UM", "CS 34", ......]
$courseindex[1] = ["AC", "PHIL 13", ....]
$courseindex[2] = ["UM:, "BIO 567', ....]

##</code><code>##

$courseindex[0] = ["AC", "PHIL 13", ....]
$courseindex[1] = ["UM", "BIO 567', ....]
$courseindex[2] = ["UM", "CS 34", ......]

##</code><code>##

@courselist = sort {$$a[n] cmp $$b[n]} @courselist;