We learned before that (Or) in the LSAT means and/or = cloud be both but at least one.

So, why does (or ) here in conditions means (or) only??

I understand that the arrow is exchangeable for (some)

A ←s→ B

But why is not when it comes to (Most)

A —m→ B

Shouldn't they both be

A ←s→ B

A ←m→ B

??

Thank you