[O] automatically closing example?

[Steinar Bang]

Is there a shortcut to quickly add an #+END_EXAMPLE at the same
indentation level as the #+BEGIN_EXAMPLE I have just typed?  I have
googled but not found.

I know that I can type C-j # + b M-TAB e M-TAB, but what I get then is
basically what I wanted after I had completed the BEGIN_EXAMPLE.

Ie. I never want an unbalanced BEGIN_EXAMPLE.