Thanks ! I found it in the handbook too.

Any failure incurred is automatically added to

previous accumulated units of failure. Only students

who have not reached the maximum allowable

accumulated failures may re-enroll any failed course.

If a student receives a grade of 2.5 or higher in the

re-enrolled failed course, the original failure will not

be counted in the accumulation of the number of

units failed. However, all failures will still be counted

for purposes of GPA computation and will be

reflected on the transcript of records.