Statement: All chairs are keys. All keys are balloons. Some balloons are mirrors. Some mirrors are desks. Conclusions: I. Some desks are keys. II. Some balloons are mirrors. III. Some mirrors are balloons.

All keys are balloons + Some balloons are mirrors = A + I = No conclusion Hence I does not follow. All chairs are keys + All keys are balloons = A + A = A = All chairs are balloons → conversion → Some balloons are chairs (I) Hence II follows. Some balloons are mirrors (I) → conversion → Some mirrors are balloons (I) Hence III follows.