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"Once the mail is fine sorted, it's bundled by unit numbers and placed in boxes for each building. By 9 a.m., 13 transportation representatives begin delivering the mail to 29 buildings on our Texas Medical Center campus. In addition, they fulfill courier requests throughout the day -- traveling between our buildings and external locations, like area hospitals."
<https://www.mdanderson.org/cancerwise/what-happens-when-you-send-a-letter-to-patient-care-team.h00-158910912.html>