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  1. or download this
    #solution 1, using regex and parsewords
use Text::ParseWords;
...
}
# end solution 1_______________________
  2. or download this
    # solution 2, using text:csv_xs
use Text::CSV_XS;
...
print "$sum\n";
# end solution 2_______________________
  3. or download this
        
my $courseID=substr($result[0],1);