# create a hrns keyed on the sfa record's pointer.
# Its possible for multiple records to have the same pointer so
# the dict's value will be a list of hrns.
persons = defaultdict(list)
for person in person_list:
# create a hrns keyed on the sfa record's pointer.
# Its possible for multiple records to have the same pointer so
# the dict's value will be a list of hrns.
persons = defaultdict(list)
for person in person_list: