texttospeech/beta/src/main/java/com/example/texttospeech/SynthesizeText.java [175:210]:
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  public static void main(String... args) throws Exception {

    ArgumentParser parser =
        ArgumentParsers.newFor("SynthesizeText")
            .build()
            .defaultHelp(true)
            .description("Synthesize a text, text with audio effect profiles, or ssml.");

    MutuallyExclusiveGroup group = parser.addMutuallyExclusiveGroup().required(true);
    group
        .addArgument("--text")
        .help("The text file from which to synthesize speech.")
        .nargs("+")
        .metavar("TEXT", "EFFECTSPROFILE(optional)");
    group.addArgument("--ssml").help("The ssml file from which to synthesize speech.");

    try {
      Namespace namespace = parser.parseArgs(args);

      if ((namespace.get("text") != null)) {
        if (namespace.getList("text").size() == 2) {
          synthesizeTextWithAudioProfile(
              namespace.getList("text").get(0).toString(),
              namespace.getList("text").get(1).toString());

        } else {
          synthesizeText(namespace.getString("text"));
        }

      } else {
        synthesizeSsml(namespace.getString("ssml"));
      }
    } catch (ArgumentParserException e) {
      parser.handleError(e);
    }
  }
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texttospeech/snippets/src/main/java/com/example/texttospeech/SynthesizeTextBeta.java [176:211]:
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  public static void main(String... args) throws Exception {

    ArgumentParser parser =
        ArgumentParsers.newFor("SynthesizeText")
            .build()
            .defaultHelp(true)
            .description("Synthesize a text, text with audio effect profiles, or ssml.");

    MutuallyExclusiveGroup group = parser.addMutuallyExclusiveGroup().required(true);
    group
        .addArgument("--text")
        .help("The text file from which to synthesize speech.")
        .nargs("+")
        .metavar("TEXT", "EFFECTSPROFILE(optional)");
    group.addArgument("--ssml").help("The ssml file from which to synthesize speech.");

    try {
      Namespace namespace = parser.parseArgs(args);

      if ((namespace.get("text") != null)) {
        if (namespace.getList("text").size() == 2) {
          synthesizeTextWithAudioProfile(
              namespace.getList("text").get(0).toString(),
              namespace.getList("text").get(1).toString());

        } else {
          synthesizeText(namespace.getString("text"));
        }

      } else {
        synthesizeSsml(namespace.getString("ssml"));
      }
    } catch (ArgumentParserException e) {
      parser.handleError(e);
    }
  }
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