This is the only question that references one of the teachers: Jiang. We know they present N and O. So you can read this question as asking which two spaces can’t be filled by N and O.
I solved this question by drawing each answer. Sometimes there’s no other method, so you should practice getting fast at making correct diagrams.
You should try making diagrams to disprove the answers yourself, now, before looking at mine.
Any diagram that follows the rules will disprove an answer, if the diagram has NO in the right places.
O is important, remember that O comes after S. That means O can’t go first. So for answers A-C, you’d have to put N first and O in the other spot.
The other rules are that PST are spread out, and T goes before W.
This diagram disproves A:
This diagram disproves C:
This diagram disproves D:
This diagram disproves E:
B is CORRECT. If you put NO in one and four, there’s no place to put PST without putting them together:
You’d be forced to put two of PST together in 2-3 or 4-5.
I also found that using diagrams from other questions helped to answer this question more quickly.
Why is N always before O? I don’t see it in the rules. Can you please explain?
Thanks for asking about this–that’s actually a typo on the explanations page. The sentence should read: “O is important, remember that O comes after S”. The page has been updated.