Statements: Some hats are threads.
Some threads are button.
No button is mat.
Conclusions: I. Some hats are button.
II. All threads are hats.
Some hats are threads (I) + Some threads are button (I) ⇒ no conclusion can be drawn. Hence, conclusion I will not follow. Some hats are threads (I) ⇒ conversion ⇒ Some threads are hats (I). Hence, conclusion II will not follow.