Electric locomotive and cannon: what they have in common

1. Step 1. Electric locomotive — has part — Railway coupling. An electric locomotive pulls its wagons through a coupling.
2. Step 2. Railway coupling — is made of — Wrought iron. A coupling is wrought iron.
3. Step 3. Wrought iron — is material for — Ironclad. The armour is wrought iron.
4. Step 4. Ironclad — has part — Cannon. Artillery.

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