Concrete pump and aeroplane: what they have in common

1. Step 1. Concrete pump — has part — Hydraulic cylinder. Hydraulics.
2. Step 2. Hydraulic cylinder — is part of — Retractable landing gear. Retraction cylinders.
3. Step 3. Retractable landing gear — is a kind of — Landing gear. Landing gear.
4. Step 4. Landing gear — is part of — Aeroplane. Landing gear.

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