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diff --git a/python/notes/version_4.md b/python/notes/version_4.md
index a7905a7..4e190c1 100644
--- a/python/notes/version_4.md
+++ b/python/notes/version_4.md
@@ -495,3 +495,65 @@ UnmatchedRefs contains entry 11:
 ```
 
 In frontend, we only have a DOI; https://fatcat.wiki/release/lookup?doi=10.1016/s0147-9563(97)90082-0
+
+## More OL matching
+
+> ran open library and fatcat fuzzy matching (via container name) on all docs,
+> that did not have an id-based match; found 139M link candidates, of which
+> verification 11M strong or exact matches, of which around 3M had some IA
+> identifier (about 200K unique; but looking at a few of them, it seems these were somewhat
+> restricted items, e.g. "print-disabled"
+
+Most referenced items were:
+
+```
+  13010 ia:discoverygrounde00glas
+   9351 ia:selfefficacyexer0000band
+   8341 ia:basicsofqualitat0000stra
+   7562 ia:researchdesignqu00cres
+   7027 ia:basicsqualitativ00stra
+   6397 ia:qualitativedataa00mile
+   5958 ia:briefhistoryneol00harv
+   5779 ia:constructinggrou00char
+   5291 ia:reassemblingsoci00lato
+   4908 ia:econometricanaly0000gree_f5q0
+   4762 ia:powerknowledges00fouc
+   4733 ia:stressappraisalc00rich
+   4673 ia:locationculture00bhab_220
+   4405 ia:threeworldswelfa00espi
+   4330 ia:bodiesthatmatter00butl_662
+   4306 ia:gendertroublefem0000butl_d7d5
+   4249 ia:contentanalysisi00krip
+   4059 ia:practiceofeveryd01cert
+   4013 ia:intermolecularsu00isra
+   3925 ia:culturesorganiza00hofs
+   3621 ia:fractalgeometryo00beno
+   3564 ia:modernityatlarge00appa
+   3483 ia:modelselectionmu00burn_141
+   3454 ia:economicinstitut00will
+   3300 ia:economictheoryof00down_0
+   3289 ia:seeinglikestateh00scot_250
+   3204 ia:densityfunctiona00parr
+   3158 ia:experienceeducat00dewe_0
+   3127 ia:infraredramanspe00naka
+   3114 ia:qualitativeinqui00cres_711
+   3088 ia:sciencehumanbeha00bfsk
+   3050 ia:structuralequati0000byrn_g1v4
+   3050 ia:numericalrecipes0000unse_j9c5
+   3003 ia:conductionheatso00cars
+   2955 ia:fifthdisciplineasen00seng
+   2793 ia:homosacersoverei00agam_937
+   2746 ia:naturalisticinqu00linc
+   2737 ia:postmoderncondit00lyot_037
+   2673 ia:mathematicsdiffu00cran
+   2576 ia:principlespracti0000klin
+   2530 ia:hydrodynamichydr00chan
+   2499 ia:strategicmanagem00free
+   2493 ia:viscoelasticprop00ferr
+   2454 ia:wehaveneverbeenm00lato_404
+   2428 ia:foucaultreader00fouc
+   2386 ia:languagesymbolic0000bour_1991
+   2381 ia:weaponsofweakeve0000scot
+   2380 ia:greattransforma000pola
+   2370 ia:crossingqualityc00amer_984
+```