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

1. Step 1. Windows — is a kind of — Operating system. An operating system.
2. Step 2. Operating system — is used in — Personal computer. An operating system.
3. Step 3. Personal computer — is a kind of — Computer. A computer.
4. Step 4. Computer — is used in — Lunar module. The Apollo Guidance Computer.
5. Step 5. Lunar module — has part — Liquid-propellant rocket engine. A descent engine.

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