issue with articles with TOC ?

Hello

So when we have an article with a toc, for example, with three pages.

so we have, the start url:
the first page:
the second:
and the last (all):
But I don't understand why, in my google webmaster tools, googlebot manage to see (and return them as duplicates) much others non existents  pages.etc...

I think this is not really normal that we can access the article with any random number for the toc, like if I try this:I access the article !! with empty content.

shouldn't we have some 404 instead ?

And perhaps this is not a Sef Advance related question, but only related to the joomla code itself.
Like a test toc condition (if..exist=ok.else..404)

Thanks for considering this case.

The problem is at Joomla level. Even without SEF a link like http://domain/index.php?option=com_content&view=article&id=26&Itemid=40&limitstart=333 is accessible.
Not really up to SEF Advance to correct.

There are many other examples but it's not really worth worrying about, such links do not exists. How does Google find them? Probably generates them randomly.