Statements: (a) All pens are papers. (b) No eraser is a paper. Conclusions: I. No eraser is a pen. II. Some papers are pens.

(i) All pens are papers → Universal Affirmative (A-type).
(ii) Some houses are lakes → Particular Affirmative (I-type).
(iii) No eraser is paper → Universal Negative (E-type).
(iv) Some erasers are not papers → Particular Negative (O-type).
All pens are papers. ↔ No paper is an eraser.
A + E ⇒ E-type of Conclusion. "No pen is an eraser".
Conclusion I is Converse of it.
Conclusion II is Converse of the first Premise.