Update parquet files

{default/abstracts → abstracts (2021)/train}/0000.parquet

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:f97fc97f73730323484b4de442f1db1b6562ea3bede32a675cd1da1253c43bc3
-size 260649505
+oid sha256:d19bfd0cfc5fa2625511120059c304bdbb5f0aa8ded153c7c7c2e43505836eca
+size 267704680

{default/abstracts → abstracts (2021)/train}/0001.parquet

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:b1b01b0d5720b69575a230f2498034c865b3f8bd093130ab41344c1c4f1cab11
-size 212570467
+oid sha256:a803c58e3a3e03f1b67575f568ec05af45489e8ace9f283f59f94002d33f8164
+size 206870877

default/abstracts/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:378f8b0bb3bb722c282682f7be8e6cd9a7b1ec9da4dcb4068123448862d8e358
-size 1513107456