Tourniquet buckle and air conditioner: what they have in common

1. Step 1. Tourniquet buckle — is part of — Tourniquet. It locks the tension.
2. Step 2. Tourniquet — uses — Pressure. Compressing the blood vessels.
3. Step 3. Pressure — is used in — Compressor. It compresses air.
4. Step 4. Compressor — is part of — Air conditioner. A compressor.

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