code: @Override
    public int count(@NullableDecl Object element) {
      AtomicInteger existingCounter = Maps.safeGet(countMap, element);
      return (existingCounter == null) ? 0 : existingCounter.get();
    }
docs: Returns the number of occurrences of {@code element} in this multiset.
  
  @param element the element to look for
  @return the nonnegative number of occurrences of the element