All squares are triangles No triangle is circle. A + E ⇒ E-type of Conclusion “No square is circle.” (P) No triangle is circle. All circles are rectangles. E + A ⇒ O1 ,-type of Conclusion “Some rectangles are not triangles."(Q) No square is circle. All circles are rectangles. E + A ⇒ O1 - -type of Conclusion “Some rectangles are not squares.” (R) None follows