Grain hopper and diesel engine: what they have in common

1. Step 1. Grain hopper — is part of — Gristmill. A hopper feeds the grain evenly.
2. Step 2. Gristmill — uses — Grain. A mill grinds grain.
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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