Ethanol and elevator: what they have in common

1. Step 1. Ethanol — is material for — Biofuel. Bioethanol.
2. Step 2. Biofuel — is used in — Diesel engine. A diesel also runs on vegetable oil.
3. Step 3. Diesel engine — is part of — Drilling rig. The drive.
4. Step 4. Drilling rig — has part — Block and tackle. The block and tackle lifts the drill string.
5. Step 5. Block and tackle — has part — Pulley. A block and tackle is several pulleys and a rope.
6. Step 6. Pulley — is part of — Elevator. The rope runs over a pulley.

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