Fix hard subset: generated hard = robust set (missed by high+xhigh+low), 119->109

data/test-00000-of-00001.parquet

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:62272da3069af094bc1195787a5ab9a3ad5336ca6fe4607f21a72f3bf04cdac4
-size 826471
+oid sha256:ec56e8b8dff2bdbbfba3d38c33f525eddbf3a20823037f3724adbfda472f2558
+size 825466