Statement: Some letters are papers
All papers are objects.
Some objects are subjects.
Conclusion: I. Some papers are not subjects.
II. All subjects are objects.
All papers are objects(A) + Some objects are subjects(I) ⇒ No conclusion. Hence conclusion I will not follow. Some objects are subjects(I) ⇒ conversion ⇒ Some subjects are objects(I). Hence conclusion II will not follow