Question 1168669
Placing inside of "pre" tags, maybe looks more like you wanted:

<pre>

__________________ 
   
    ?   ?   9    
     \ / \ /
      A   B
     / \ / \
    ?   ?   ?
     \ / \ /
      C   D
     / \ / \
    3   ?   ?
___________________
 1,2,4,5,6,7,8
</pre>