diff --git a/unified_full_viewing_keys.py b/unified_full_viewing_keys.py
index 3796623..07a1107 100755
--- a/unified_full_viewing_keys.py
+++ b/unified_full_viewing_keys.py
@@ -1,21 +1,17 @@
 #!/usr/bin/env python3
 import sys; assert sys.version_info[0] >= 3, "Python 3 required."
 
-import math
 from random import Random
-import struct
 
 from cryptography.hazmat.primitives.asymmetric import ec
 from cryptography.hazmat.primitives.serialization import PublicFormat, Encoding
 
 from zcash_test_vectors.output import render_args, render_tv, Some
 from zcash_test_vectors.rand import Rand, randbytes
-from zcash_test_vectors.zc_utils import write_compact_size, parse_compact_size
-from zcash_test_vectors.f4jumble import f4jumble, f4jumble_inv
 from zcash_test_vectors.orchard import key_components as orchard_key_components
 from zcash_test_vectors.sapling import zip32 as sapling_zip32
 from zcash_test_vectors.unified_encoding import encode_unified, decode_unified
-from zcash_test_vectors.unified_encoding import P2PKH_ITEM, P2SH_ITEM, SAPLING_ITEM, ORCHARD_ITEM
+from zcash_test_vectors.unified_encoding import P2PKH_ITEM, SAPLING_ITEM, ORCHARD_ITEM
 
 def main():
     args = render_args()