Some rivers are oceans. All oceans are waterfalls I + A ⇒ I-type of Conclusion "Some rivers are waterfalls"., This is Conclusion II. Some curtains are pillows All pillows arc blankets I + A ⇒ I - type of Conclusion “Some curtains are blankets".All pillows are blankets All blankets are doormats. A + A =* A-type of Conclusion “All pillows are doormats". Some curtains are blankets. All blankets are doormats I + A = I - type of Conclusion “Some curtains are doormats". Venn diagrams of "Some curtains are blankets":
Venn diagrams III contradicts the Conclusion II. Venn diagrams of “Some curtains are doormats":