diff --git a/f4jumble.py b/f4jumble.py
index 342cabd..f6f0e44 100644
--- a/f4jumble.py
+++ b/f4jumble.py
@@ -92,7 +92,6 @@ def main():
     rand = Rand(randbytes)
 
     plain_test_vectors = []
-    hashed_test_vectors = []
 
     # Generate test vectors with various lengths:
     for l_M in [
@@ -115,20 +114,6 @@ def main():
             'jumbled': jumbled,
         })
 
-    for l_M in [
-        (rand.u32() % (MAX_l_M - MIN_l_M)) + MIN_l_M,
-        MAX_l_M,
-    ]:
-        M = bytes([i & 0xFF for i in range(l_M)])
-        jumbled = f4jumble(M)
-        assert len(jumbled) == len(M)
-        assert f4jumble_inv(jumbled) == M
-
-        hashed_test_vectors.append({
-            'length': l_M,
-            'jumbled_hash': blake2b(jumbled).digest()
-        })
-
     render_tv(
         args,
         'f4jumble',
@@ -138,16 +123,6 @@ def main():
         ),
         plain_test_vectors,
     )
-    print()
-    render_tv(
-        args,
-        'f4jumble',
-        (
-            ('length', 'usize'),
-            ('jumbled_hash', 'Vec<u8>'),
-        ),
-        hashed_test_vectors,
-    )
 
 
 if __name__ == "__main__":
diff --git a/f4jumble_long.py b/f4jumble_long.py
new file mode 100755
index 0000000..2b1553c
--- /dev/null
+++ b/f4jumble_long.py
@@ -0,0 +1,41 @@
+#!/usr/bin/env python3
+import sys; assert sys.version_info[0] >= 3, "Python 3 required."
+
+from pyblake2 import blake2b
+
+from tv_output import render_args, render_tv
+from f4jumble import f4jumble, f4jumble_inv, MAX_l_M
+
+
+def main():
+    args = render_args()
+
+    hashed_test_vectors = []
+
+    for l_M in [
+        3246395,
+        MAX_l_M,
+    ]:
+        M = bytes([i & 0xFF for i in range(l_M)])
+        jumbled = f4jumble(M)
+        assert len(jumbled) == len(M)
+        assert f4jumble_inv(jumbled) == M
+
+        hashed_test_vectors.append({
+            'length': l_M,
+            'jumbled_hash': blake2b(jumbled).digest()
+        })
+
+    render_tv(
+        args,
+        'f4jumble_long',
+        (
+            ('length', 'usize'),
+            ('jumbled_hash', 'Vec<u8>'),
+        ),
+        hashed_test_vectors,
+    )
+
+
+if __name__ == "__main__":
+    main()