Statements: All gates are lights.
No street is a gate.
All lights are houses.
Conclusions I. All gates are houses.
II. Some houses are not lights.
III. Some lights are streets.
All gates are lights(A) + All lights are houses(A) ⇒ All gates are houses(A). Hence, conclusion I follows. All lights are houses(A) ⇒ Conversion ⇒ Some houses are lights (I). Hence, conclusion II does not follow. No street is a gate(E) + All gates are lights(A) ⇒ Some lights are not streets(O*). Hence, conclusion III does not follow.
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