let's _use_ an object-oriented data structure
   maybe to plot a graph.
   this is hard for me to do now.
   oh no what language.
   maybe python because i'm familiar with it.
   class Node:
     def __init__(self, parent = None):
       self.children = []
       self.parent = parent
   y'know, this is so hard for me to do, maybe I should get to know a data
   structures library in every language.