docs: def find_valid_combinations(cert_file_name_list, jwt_file_name_list):
      """Given a list of cert and JWT file names, print a list showing each combination
      along with indicators for combinations where the JWT signature was successfully
      validated with the cert."""
      for cert_file_name in cert_file_name_list:
          cert_pem = ''  # self.test_files.load_utf8_to_str(cert_file_name)
          cert_obj = d1_common.cert.x509.deserialize_pem(cert_pem)
          # d1_common.cert.x509.log_cert_info(logging.info, 'CERT', cert_obj)
          for jwt_file_name in jwt_file_name_list:
              jwt_bu64 = ''  # self.test_files.load_utf8_to_str(jwt_file_name)
              # d1_common.cert.jwt.log_jwt_bu64_info(logging.info, 'JWT', jwt_bu64)
              is_ok = False
              try:
                  d1_common.cert.jwt.validate_and_decode(jwt_bu64, cert_obj)
              except d1_common.cert.jwt.JwtException as e:
                  logging.info('Invalid. msg="{}"'.format(str(e)))
              else:
                  is_ok = True
              logging.info(
                  '{} {} {}'.format(
                      '***' if is_ok else '   ', cert_file_name, jwt_file_name
                  )
              )