iteratee Where is >>== and other combinators?

[Edward Z. Yang]

In his DEFUN08 talk notes [1],  Oleg introduces a number of combinators
for handling iteratees.  The one I noticed, in particular, that was missing
was the >>== combinator, which is analogous to monadic bind but in the
vertical direction.  I am curious to know if this was purposely omitted
or just an oversight.

Cheers,
Edward

[1] http://okmij.org/ftp/Haskell/Iteratee/IterateeIO-talk-notes.pdf