#PO_Box_No__post-office_box_No__post-office_box_number__PO_box_number  the number of a letter box at the post office where mail is collected
  supertype:  integer_address_part__integeraddresspart (pm)
  part of:  mailing_address
  subtype:  region_PO_Box_No
  subtype:  GPO/PMB_Box_No

1 statement is about an indirect instance of PO_Box_No (region_PO_Box_No): graph1_on_address
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