Stretcher spreader bars and car: what they have in common

1. Step 1. Stretcher spreader bars — is part of — Stretcher. They keep the canvas taut.
2. Step 2. Stretcher — is part of — Ambulance. A stretcher.
3. Step 3. Ambulance — evolved from — Truck. A special-purpose vehicle.
4. Step 4. Truck — evolved from — Car. A goods motor vehicle.

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