Dashboard and elevator: what they have in common

1. Step 1. Dashboard — has part — Odometer. An odometer.
2. Step 2. Odometer — has part — Gear. Gear counters.
3. Step 3. Gear — is part of — Tide-predicting machine. Gear wheels set the harmonics.
4. Step 4. Tide-predicting machine — has part — Pulley. Pulleys add up the harmonics.
5. Step 5. Pulley — is part of — Elevator. The rope runs over a pulley.

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