Cart and internal combustion engine: what they have in common

1. Step 1. Cart — evolved into — Carriage. A covered cart on springs.
2. Step 2. Carriage — has part — Leaf spring. Leaf springs softened the ride of carriages.
3. Step 3. Leaf spring — is part of — Military jeep. Leaf-spring suspension.
4. Step 4. Military jeep — has part — Internal combustion engine. A petrol engine.

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