would love to buddy study/test. I prefer to start from 9 or 10am EST or afternoon hours work too. Please ping me if anyone like my hours.

#help T148 Section 3 problem 24 "manuscripts that are not frequently consulted by researchers will not be restored." I am very confused by whether to use condition one, i.e. sufficient or Condition four, negate necessary in this case, because the key word NOT as they generate different equation. The answer is using condition one obviously, utilizing conrapositive, to arrive at R->FC. But if I use Condition four, negate necessary, it becomes, FC->//R, thus /R->/FC, and you can never get R->FC from here. Can someone shine a light on this? I often found it is the negative and double negative that mess up my understanding and translating. Thank you!

@yuchengya467

#help "manuscripts that are not frequently consulted by researchers will not be restored." I am very confused by whether to use condition one, i.e. sufficient or Condition four, negate necessary in this case, because the key word NOT as they generate different equation. You are using condition one obviously. But if I use Condition four, negate necessary, it becomes, FC->//R, thus /R->/FC, and you can never get R->FC from here. Can someone shine a light on this?