diff --git a/notes/tmp/errordata b/notes/tmp/errordata
new file mode 100644
index 0000000..2df356d
--- /dev/null
+++ b/notes/tmp/errordata
@@ -0,0 +1,27 @@
+"Error message from worker: Traceback (most recent call last):
+  File "/usr/local/lib/python3.7/site-packages/dataflow_worker/batchworker.py", line 651, in do_work
+    work_executor.execute()
+  File "/usr/local/lib/python3.7/site-packages/dataflow_worker/executor.py", line 181, in execute
+    op.finish()
+  File "dataflow_worker/native_operations.py", line 93, in dataflow_worker.native_operations.NativeWriteOperation.finish
+  File "dataflow_worker/native_operations.py", line 94, in dataflow_worker.native_operations.NativeWriteOperation.finish
+  File "dataflow_worker/native_operations.py", line 95, in dataflow_worker.native_operations.NativeWriteOperation.finish
+  File "/usr/local/lib/python3.7/site-packages/dataflow_worker/nativeavroio.py", line 308, in __exit__
+    self._data_file_writer.flush()
+  File "fastavro/_write.pyx", line 664, in fastavro._write.Writer.flush
+  File "fastavro/_write.pyx", line 639, in fastavro._write.Writer.dump
+  File "fastavro/_write.pyx", line 451, in fastavro._write.snappy_write_block
+  File "fastavro/_write.pyx", line 458, in fastavro._write.snappy_write_block
+  File "/usr/local/lib/python3.7/site-packages/apache_beam/io/filesystemio.py", line 200, in write
+    self._uploader.put(b)
+  File "/usr/local/lib/python3.7/site-packages/apache_beam/io/gcp/gcsio.py", line 720, in put
+    self._conn.send_bytes(data.tobytes())
+  File "/usr/local/lib/python3.7/multiprocessing/connection.py", line 200, in send_bytes
+    self._send_bytes(m[offset:offset + size])
+  File "/usr/local/lib/python3.7/multiprocessing/connection.py", line 393, in _send_bytes
+    header = struct.pack("!i", n)
+struct.error: 'i' format requires -2147483648 <= number <= 2147483647
+"
+
+
+"Out of memory: Killed process 2042 (python) total-vm:28616496kB, anon-rss:25684136kB, file-rss:0kB, shmem-rss:0kB, UID:0 pgtables:51284kB oom_score_adj:900"
diff --git a/notes/tmp/exampledata b/notes/tmp/exampledata
new file mode 100644
index 0000000..97c9248
--- /dev/null
+++ b/notes/tmp/exampledata
@@ -0,0 +1,44 @@
+[{
+  "property_id": "3cf3c06632c46754696f2017933702f3",
+  "flat_appartment": "",
+  "builing": "",
+  "number": "63",
+  "street": "ROTTON PARK STREET",
+  "locality": "",
+  "town": "BIRMINGHAM",
+  "district": "BIRMINGHAM",
+  "county": "WEST MIDLANDS",
+  "postcode": "B16 0AE",
+  "property_transactions": [
+    { "price": "385000", "transaction_date": "2021-01-08", "year": "2021" },
+    { "price": "701985", "transaction_date": "2019-03-28", "year": "2019" },
+    { "price": "1748761", "transaction_date": "2020-05-27", "year": "2020" }
+  ],
+  "latest_transaction_year": "2021"
+},
+{
+    "property_id": "c650d5d7bb0daf0a19bb2cacabbee74e",
+    "readable_address": "16 STATION ROAD\nPARKGATE\nNESTON\nCHESHIRE WEST AND CHESTER\nCH64 6QJ",
+    "flat_appartment": "",
+    "builing": "",
+    "number": "16",
+    "street": "STATION ROAD",
+    "locality": "PARKGATE",
+    "town": "NESTON",
+    "district": "CHESHIRE WEST AND CHESTER",
+    "county": "CHESHIRE WEST AND CHESTER",
+    "postcode": "CH64 6QJ",
+    "property_transactions": [
+        {
+        "price": "280000",
+        "transaction_date": "2020-11-30",
+        "year": "2020"
+        },
+        {
+        "price": "265000",
+        "transaction_date": "2020-05-29",
+        "year": "2020"
+        }
+    ],
+    "latest_transaction_year": "2020"
+}]
diff --git a/notes/tmp/runningdata b/notes/tmp/runningdata
new file mode 100644
index 0000000..0929edb
--- /dev/null
+++ b/notes/tmp/runningdata
@@ -0,0 +1,16 @@
+
+
+Create Mapping table
+('fd4634faec47c29de40bbf7840723b41', ['317500', '2020-11-13 00:00', 'B90 3LA', '1', '', 'VERSTONE ROAD', 'SHIRLEY', 'SOLIHULL', 'SOLIHULL', 'WEST MIDLANDS', ''])
+('fd4634faec47c29de40bbf7840723b41', ['317500', '2020-11-13 00:00', 'B90 3LA', '1', '', 'VERSTONE ROAD', 'SHIRLEY', 'SOLIHULL', 'SOLIHULL', 'WEST MIDLANDS', ''])
+
+Condensing
+{'fd4634faec47c29de40bbf7840723b41': ['317500', '2020-11-13 00:00', 'B90 3LA', '1', '', 'VERSTONE ROAD', 'SHIRLEY', 'SOLIHULL', 'SOLIHULL', 'WEST MIDLANDS', '']}
+
+
+Prepared
+GroupByKey
+('fe205bfe66bc7f18c50c8f3d77ec3e30', ['fd4634faec47c29de40bbf7840723b41', 'fd4634faec47c29de40bbf7840723b41'])
+
+deduplicated
+('fe205bfe66bc7f18c50c8f3d77ec3e30', ['fd4634faec47c29de40bbf7840723b41'])