Road roller and fitness tracker: what they have in common

1. Step 1. Road roller — has part — Diesel engine. A diesel.
2. Step 2. Diesel engine — is part of — Bus. The engine is usually a diesel.
3. Step 3. Bus — has part — Air suspension. Buses run on air suspension.
4. Step 4. Air suspension — is made of — Vulcanized rubber. The air spring is rubberized cord.
5. Step 5. Vulcanized rubber — is material for — Fitness tracker. The strap is silicone.

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