XC “EASY”: Task 6 should refer to (29)
By accident, I seem to have left some references to sentence (18) in the statement of Task 6 on the extra credit problem about Trees are easy to draw. Those should refer to sentence (29)—that is, the question is about how himself in (29) satisfies Principle A, and refers at one point to for John, which is also in (29).
Sorry about the typo.