+---+
   | i |
   +---+---+---+---+   
   | e | f | y | e |
   +---+---+---+---+
               | h |
               +---+

   +---+
   | e |
   +---+---+---+---+
   | p | t | s | l |
   +-- +---+---+---+
   | u |
   +---+

       +---+
       | h |
   +---+---+---+---+
   | e | n | i | p |
   +---+---+---+---+
           | s |
           +---+

       +---+
       | l |
   +---+---+---+---+
   | e | c | a | r |
   +---+---+---+---+
       | s |
       +---+

           +---+
           | a |
   +---+---+---+---+
   | v | n | d | z |
   +---+---+---+---+
               | e |
               +---+

       +---+
       | d |
   +---+---+---+---+
   | k | u | n | t |
   +---+---+---+---+
               | o |
               +---+

       +---+
       | s |
       +---+
       | n |
   +---+---+---+
   | e | d | w |
   +---+---+---+
   | o |
   +---+
       
       +---+
       | t |
       +---+---+
       | g | i |
   +---+---+---+
   | e | v |
   +---+---+
   | n |
   +---+

       +---+---+
       | e | y |
       +---+---+
       | l |
   +---+---+
   | u | g |
   +---+---+
   | k |
   +---+
   
           +---+
           | f |
       +---+---+
       | b | i |
   +---+---+---+
   | r | s |
   +---+---+
   | o |
   +---+

       +---+
       | b |
       +---+
       | q |
   +---+---+
   | a | j |
   +---+---+
   | m |
   +---+
   | o |
   +---+