Statement: All pins are rods. Some rods are chains. All chains are hammers. Conclusions: I. Some pins are hammers. II. Some hammers are rods III. No pin is hammer.

All pins are rods + Some rods are chains = A + I = No conclusion Hence I and II does not follow. However, the two a complementary I-E pair, Hence either I or III follows. Some rods are chains + All chains are Hammers = I + A + I = Some rods are hammers → conversion → Some hammers are rods (I). Hence III follows.