Haemodialysis machine and elevator: what they have in common

1. Step 1. Haemodialysis machine — uses — Pressure. Diffusion through a membrane.
2. Step 2. Pressure — is used in — Foundation. A wide base reduces the pressure on the ground.
3. Step 3. Foundation — is part of — Skyscraper. A deep foundation.
4. Step 4. Skyscraper — has part — Elevator. A skyscraper is impossible without a lift.

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