CS 132 Assignment 13 

  Write a program that reads a file of word/synonym pairs and stores them in a 
  binary tree, ordered by the first word. 

  The program then reads a text and prints it, replacing occurrences of the first 
  word by the synonym. Construct your own sample input files for synonyms and text. 

* Devise a way to use more than one synonym for a word, rotating among the 
  possible choices.