Joint replacement and air conditioner: what they have in common

1. Step 1. Joint replacement — is made of — Titanium. A titanium stem.
2. Step 2. Titanium — is material for — Turbojet engine. Compressor blades.
3. Step 3. Turbojet engine — has part — Compressor. The compressor compresses the air.
4. Step 4. Compressor — is part of — Air conditioner. A compressor.

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