Add 1BT: k=4 addition (45,004,481 train + 5,000,519 test examples)

1BT/test-00000-of-00001.parquet

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:17b26d8b40f611113286bbb321394a3e8a9587ad747dc0d31efd4ca5e55249df
+size 70484379

1BT/train-00000-of-00001.parquet

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:38882d6ba8ef8fa92eb1786d43d297a0dee23f3798e6c30650dd0768f7f593e3
+size 634124957