Bag and refrigerator: what they have in common

1. Step 1. Bag — has part — Zip. A zip.
2. Step 2. Zip — is part of — Wetsuit. A zip on the back.
3. Step 3. Wetsuit — uses — Thermal insulation. Insulation.
4. Step 4. Thermal insulation — is part of — Freezer. Polyurethane foam in the walls.
5. Step 5. Freezer — is a kind of — Refrigerator. A refrigeration appliance.

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