val = pwn_read(addr)
Medium difficulty hints, answers for March 10 PipsNumber (9): Everything in this space must add up to 9. The answer is 4-5, placed horizontally; 5-2, placed horizontally.
，更多细节参见新收录的资料
`@receiver isNil ifTrue: `@nilBlock -> `@receiver ifNil: `@nilBlockIn fact, both versions work—but they apply different filters to the target node. Try to remember which one.。新收录的资料是该领域的重要参考
Share on Twitter，这一点在新收录的资料中也有详细论述