code: @Override
      public ListLexiconsResult listLexicons(ListLexiconsRequest request) {
          request = beforeClientExecution(request);
          return executeListLexicons(request);
      }
docs: <p>
  Returns a list of pronunciation lexicons stored in an AWS Region. For more information, see <a
  href="http://docs.aws.amazon.com/polly/latest/dg/managing-lexicons.html">Managing Lexicons</a>.
  </p>
  
  @param listLexiconsRequest
  @return Result of the ListLexicons operation returned by the service.
  @throws InvalidNextTokenException
  The NextToken is invalid. Verify that it's spelled correctly, and then try again.
  @throws ServiceFailureException
  An unknown condition has caused a service failure.
  @sample AmazonPolly.ListLexicons
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/polly-2016-06-10/ListLexicons" target="_top">AWS API
  Documentation</a>