Spring mattress and liquid-propellant rocket engine: what they have in common

1. Step 1. Spring mattress — is made of — Cotton. The cover is cotton fabric.
2. Step 2. Cotton — is material for — Glider. Covered with cotton fabric.
3. Step 3. Glider — has part — Wing. Wings.
4. Step 4. Wing — is part of — Space Shuttle. It landed like a glider.
5. Step 5. Space Shuttle — has part — Liquid-propellant rocket engine. Hydrogen-fuelled main engines.

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