Traditional Logic answer error?

[lfmhouse]

I thought I was "getting it" regarding the opposition of statements; however, I'm stumped.
On page 80, question 42, the first sentence reads, "The A statement and the E statement are not subcontrary because, although they differ in quality, they do not differ in quantity.
I answered False thinking the reason they are not subcontrary is because they are universal, not particular.
I wondered if the answer key is wrong, but I know it's probably something I'm not seeing.
Please help!
Thank you very much.

[Martin Cothran]

Yes. You are correct. That is an error in the key. It should be false. We will correct that in the next edition. Good catch.