     bucket_difference(bucket1, bucket2)
   end
 
-  defp bucket_difference([], bucket) do
+  defp bucket_difference([], _bucket) do
     { [], 0 }
   end
 

    { [], nil, 0 }
  end

  defp bucket_get([member|bucket], member) do
    member
  end


    bucket_get(bucket, candidate)
  end

  defp bucket_get(_, _member) do
    nil
  end

