Artificial heart and sewage treatment plant: what they have in common

1. Step 1. Artificial heart — has part — Piston pump. A pulsatile pump.
2. Step 2. Piston pump — is part of — Concrete pump. A piston pump.
3. Step 3. Concrete pump — uses — Concrete. It pumps concrete.
4. Step 4. Concrete — is material for — Sewage treatment plant. The tanks are concrete.

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