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-rw-r--r--python/notes/version_4.md20
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diff --git a/python/notes/version_4.md b/python/notes/version_4.md
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@@ -821,3 +821,23 @@ all duplicates, e.g. when the indices are different, but the reference is
actually the same.
Would need to "uniq" tool for the whole ref blob or something like that.
+
+----
+
+## QA: duplicates
+
+There seem to be many self-links in the dataset:
+
+* sample: 25668733, duplicate rows: 1913155; about 8% (although only 145030 uniq; many repetitions)
+
+```
+$ LC_ALL=C awk '$1 == $2' bref_tabs.tsv # ....
+56fbxcue6rdxlmxqto7vibg2xi 56fbxcue6rdxlmxqto7vibg2xi exact doi crossref
+o2juqzskxzdtpbait5gxg3yf4q o2juqzskxzdtpbait5gxg3yf4q exact doi crossref
+6mwdlhvbljgtdntz5qifywhsn4 6mwdlhvbljgtdntz5qifywhsn4 exact doi crossref
+t7vluqxmgbe4pipf4nkfcayedq t7vluqxmgbe4pipf4nkfcayedq exact doi crossref
+iofm6brptvczlnrys5vxw34x3i iofm6brptvczlnrys5vxw34x3i exact doi crossref
+soa44abzivcnfnsx4ymxvbyg44 soa44abzivcnfnsx4ymxvbyg44 exact doi crossref
+7fs4c3u2ofcmxie344o5e4wuxi 7fs4c3u2ofcmxie344o5e4wuxi exact doi crossref
+igyewr6er5epfozhk7dyfqa5tu igyewr6er5epfozhk7dyfqa5tu exact doi crossref
+```