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Re:Ask HN: What is your favorite internet rabbit hole? by cpfohl on Monday October 24, 2016 @04:00PM (#12782307)
Pretty sure its just a suffix That indicates a second encounter with the patient
Re:Ask HN: What is your favorite internet rabbit hole? by emodendroket on Monday October 24, 2016 @04:32PM (#12782603)
Looking at the examples, they end with A for initial and D for subsequent visits.