if you didn't just post a part of the output, my tree would look like this:

.
\--dbf
   |--palindrome
   |--plot
   \--rules
      \--abc1
         |--ba
         |--de
         \--te
[download]

You see? I need to know, when I'm at "dbf", "rules", "abc1" and "te", that this one is the last element in the respective directory to stop printing the superfluous "|" characters you have.