In this letter, written to "Men Suspended for Unsatisfactory Attendance," College Dean Lloyd Neidlinger makes it crystal clear that even though these men may have been readmitted on a probationary status, their suffering will not end when their probation has concluded. Instead, if they receive even one unexcused absence from class for the remainder of their undergraduate experience, Dean Neidlinger says that they will be "permanently subject to immediate separation" from the college. It's unclear how many absences it took for the Dean to take a scorched earth approach, but it sounds like these "Men" must have been legends among their classmates.
To see more of the history of class absences, sneak over to Rauner and ask for the vertical file on "Absences and Excuses."