Upload four-cubes shard 20

cubes-20.txt

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:856a8d41e7fc630f41b70f6d7183a9f12574a873a6b02cf42e056d79eb1bd20a
-size 575888074
+oid sha256:13d2dd3bb7fc526bcab57950474094ac248a6e073bb1be78b49d9fb91c41e4ef
+size 560298395