gistfile1.txt

+-------------------------------+
|           Start               |
+-------------------------------+
              |
              v
+-------------------------------+
| For each transaction in       |
| TRANSACTIONS                  |
+-------------------------------+
              |
              v
+-------------------------------+
| Get property_code and amount  |
+-------------------------------+
              |
              v
+-------------------------------+
|   Is amount > 0 ?             |
+--------+--------------+------+
         |              |
        Yes             No
         |              |
         v              v
+----------------+   +-------------------------------+
| summary[prop_code] |   | summary[prop_code]           |
| ["total_rents"]   |   | ["total_repairs"]           |
| += amount         |   | += abs(amount)              |
+----------------+   +-------------------------------+
         |              |
         +-------+------+
                 |
                 v
+-------------------------------+
|     Next transaction?         |
+-------------------------------+
              |
              v
           [End]