Rocket core stage and car: what they have in common

1. Step 1. Rocket core stage — is part of — R-7 rocket. A second stage that runs from liftoff.
2. Step 2. R-7 rocket — has part — Liquid-propellant rocket engine. RD-107 and RD-108 engines.
3. Step 3. Liquid-propellant rocket engine — is part of — Lunar module. A descent engine.
4. Step 4. Lunar module — has part — Landing gear. Legs.
5. Step 5. Landing gear — has part — Pneumatic tyre. Aircraft tyres.
6. Step 6. Pneumatic tyre — is part of — Car. Car wheels have pneumatic tyres.

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