10.
The Discourse as Simple Version
278.
"There are these three feelings, monks.
Which three?
Pleasant feeling, unpleasant feeling, neither-unpleasant-nor-pleasant feeling -
these, monks, are the three feelings."
The tenth.
Suddhika Sutta [SN 36.30, PTS 4.235]
Also known as: Suddhikasuttaṃ