Horse collar and diesel engine: what they have in common

1. Step 1. Horse collar — is used in — Seed drill. Horse traction.
2. Step 2. Seed drill — uses — Grain. It sows grain in rows.
3. Step 3. Grain — is used in — Combine harvester. The combine harvests grain.
4. Step 4. Combine harvester — has part — Diesel engine. Self-propelled combines run on diesels.

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