code: private void addOptions() {
  
          argOptions.addOption('p', "printSimilarity",
                               "whether to print the similarity score " +
                               "(default: false)",
                               false, null, "Program Options");
          // dj: current unsupported; will be next release
          //         argOptions.addOption('s', "similarityFunction",
          //                              "name of a similarity function (default: cosine)",
          //                              true, "String", "Program Options");
          argOptions.addOption('n', "numSimilar", "the number of similar words " +
                               "to print (default: 10)", true, "String", 
                               "Program Options");
          argOptions.addOption('t', "threads", "the number of threads to use" +
                               " (default: #procesors)", true, "int", 
                               "Program Options");
          argOptions.addOption('w', "overwrite", "specifies whether to " +
                               "overwrite the existing output (default: true)",
                               true, "boolean", "Program Options");
          argOptions.addOption('v', "verbose", "prints verbose output "+ 
                               "(default: false)", false, null, 
                               "Program Options");
      }
docs: Adds all of the options to the {@link ArgOptions}.