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diff --git a/python/notes/version_4.md b/python/notes/version_4.md
index dadbd3e..633f47f 100644
--- a/python/notes/version_4.md
+++ b/python/notes/version_4.md
@@ -208,3 +208,93 @@ Example Work:
   "revision": 3
 }
 ```
+
+----
+
+## Unmatched
+
+If we exclude any id and title, we'll roughly have the following fields:
+
+```
+container_name|contrib_raw_names|year                                        64064559
+unstructured                                                                 61711602
+container_name|contrib_raw_names|volume|year                                 49701699
+container_name|contrib_raw_names|unstructured|volume|year                    36401044
+container_name|contrib_raw_names|unstructured|year                           26663422
+contrib_raw_names|unstructured                                               16731608
+container_name|contrib_raw_names|doi|unstructured|year                       14207167
+container_name|contrib_raw_names|doi|year                                    13159340
+```
+
+Some examples:
+
+```
+{
+  "biblio": {
+    "container_name": "Intern. J. Comput. Math.",
+    "contrib_raw_names": [
+      "D. Levin"
+    ],
+    "volume": "B3",
+    "year": 1973
+  },
+  "index": 19,
+  "key": "PhysRevB.48.6913Cc15R1",
+  "ref_source": "crossref",
+  "release_year": 1993,
+  "release_ident": "i6s6e64n55hh5oned32mdwrs2i",
+  "work_ident": "aaaeuvgitzfafczctw3bseauri"
+}
+```
+
+This refers to:
+
+* https://www.tandfonline.com/doi/abs/10.1080/00207167308803075
+* 1972, and not 1973, 1993
+* https://fatcat.wiki/release/3cstmufhszalvpnppwxjohnnsa
+
+It would help to go from "container name" to "issn", e.g. here: 0020-7160
+
+* https://fatcat.wiki/release/search?q=levin+container_id%3A%22y4k3i2fvabgarkvywismzvy23a%22+year%3A1972
+
+```
+$ grep -i "Intern.*J.*Comput.*Math.*" jabbrev.json
+{"name": "COMPEL-THE INTERNATIONAL JOURNAL FOR COMPUTATION AND MATHEMATICS IN ELECTRICAL AND ELECTRONIC ENGINEERING", "abbrev": "COMPEL"}
+{"name": "INTERNATIONAL JOURNAL OF APPLIED MATHEMATICS AND COMPUTER SCIENCE", "abbrev": "INT J APPL MATH COMP"}
+{"name": "INTERNATIONAL JOURNAL OF COMPUTER MATHEMATICS", "abbrev": "INT J COMPUT MATH"}
+```
+
+Lookup name in issn:
+
+
+```
+$ zstdcat tmp/data.ndj.zst | grep -i "INTERNATIONAL JOURNAL OF COMPUTER MATHEMATICS" | jq .
+
+  "@graph": [
+    {
+      "@id": "http://id.loc.gov/vocabulary/countries/enk",
+      "label": "England"
+    },
+    {
+      "@id": "organization/ISSNCenter#_1",
+      "@type": "http://schema.org/Organization"
+    },
+    {
+      "@id": "resource/ISSN-L/0020-7160",
+      "identifiedBy": "resource/ISSN/0020-7160#ISSN-L"
+    },
+    {
+      "@id": "resource/ISSN/0020-7160",
+      "@type": [
+        "http://id.loc.gov/ontologies/bibframe/Instance",
+        "http://id.loc.gov/ontologies/bibframe/Work",
+        "http://schema.org/Periodical"
+      ],
+      "format": "vocabularies/medium#Print",
+      "http://purl.org/ontology/bibo/issn": "0020-7160",
+      "identifiedBy": [
+        "resource/ISSN/0020-7160#ISSN-L",
+        "resource/ISSN/0020-7160#ISSN",
+        "resource/ISSN/0020-7160#KeyTitle"
+      ],
+```