Smelting and shipping container: what they have in common

1. Step 1. Smelting — uses — Combustion. Charcoal provides heat and reduces the metal from the ore.
2. Step 2. Combustion — is used in — Lighthouse. Ancient lighthouses shone with fire.
3. Step 3. Lighthouse — is part of — Seaport. A lighthouse.
4. Step 4. Seaport — has part — Container crane. Container cranes.
5. Step 5. Container crane — uses — Shipping container. It moves containers.

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