Alright did a little bit of testing.
Luke saying “lesson” in “lesson two” sounds perfect. The problem is finding a good source of him saying “three”. I tried the one of him telling Rey that he will give her three lessons, but it is too short and doesn’t match.
Could try other words too if that helps, like Final, Last or Third?
EDIT: He does say the word “last” a few times. Not sure if that helps or not.