I have a logic question I was wondering if you could help me with.

So I was doing a MBF question on Test 41 section 1. Essentially, the stimulus gives you two conditionals.

I know you cannot get a contrapositive out of A (Most)-> B nor out of A (some)B. So my question is is why can you not do this logical move, when you start with the original conditional statement

Normal

Contrapositive

A->B:

By inference we can say A (most)-> B

By inference we can say A(some)B

The contrapositive being~B->~A:

By inference we can say ~B (most)-> ~A

By inference we can say ~A(some)B~

While I know that we cannot get a contrapositives from “most” conditionals and “some” conditionals, from this chart it seems like we can?

I understand from ALL you can imply MOST, from MOST you can imply SOME or from ALL you can imply SOME.

So what I am missing or not realizing?