code: public static void waitUntilAllElementsArePresent(final String... locators) {
          logger.entering(new Object[] { Arrays.toString(locators) });
          Preconditions.checkArgument(locators != null, "Please provide a valid set of locators.");
          for (String eachLocator : locators) {
              waitUntilElementIsPresent(eachLocator);
          }
          logger.exiting();
      }
docs: Waits until both two elements appear at the page Waits until all the elements are present on the DOM of a page.
  This does not necessarily mean that the element is visible.
  
  @param locators
  an array of strings that represents the list of elements to check.