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No mirror is a door (E) ⇒ conversion ⇒ No door is a mirror (E) ⇒ I.I. ⇒ Some doors are not mirror (O). Hence, conclusion I will not follow. No mirror is a door(E) + Some doors are windows(I) ⇒ Some windows are not mirror(O*). Hence, conclusion I will not follow. All houses are windows(A) ⇒ conversion ⇒ Some windows are houses(I). Hence, conclusion III will follow.
The greatest number that will divide 398, 437 and 5425 leaving 7, 12 and 2 as remainders, respectively, is:
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