Spark plug and freezer: what they have in common

1. Step 1. Spark plug — uses — Electric arc. A spark is an electric discharge.
2. Step 2. Electric arc — is used in — Plasma cutting. An arc.
3. Step 3. Plasma cutting — has part — Compressor. Supplying the plasma gas.
4. Step 4. Compressor — is part of — Freezer. A compressor compresses the refrigerant.

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