All windows are doors. ⇒ I.I ⇒ Some windows are doors (I). Hence Ist follows. All windows are doors. ⇒ I.I ⇒ Some doors are windows(I) + All windows are walls(A) ⇒ Some doors are walls (I) ⇒ Conversion ⇒ Some walls are doors(I). Hence II also follows. A + I = no conclusion. Hence, III doesn’t follow. E + A = O*. Hence, IV doesn’t follow .
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