I'm a bit confused about the difference between the wording in question 3 v question 4, and why question 4 is treated the same as questions 1/2. Can someone explain why the processes are different even though they're using essentially the same wording?

Are there strategies for identifying when a conclusion is implicit beyond the question stem and that it might feel like there's no real conclusion in the stimulus?

Most letters are mailed by the USPS

All letters mailed by the USPS have stamps

Most letters have stamps