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No cover is a page (E) ⇒ Conversion ⇒ some pages are not covers (O). Hence Conclusion I will not follow No pen is a cover (E) ⇒ Conversion ⇒ No cover is a pen (E) ⇒ Hence Conclusion II follows No cover is a page (E) + All pages are stickers (A) ⇒ Some stickers are not covers (O*). Hence conclusion III will follow.