Plastic bag and heat pump: what they have in common

1. Step 1. Plastic bag — has part — Handles. Cut-out handles.
2. Step 2. Handles — is part of — Saucepan. Handles.
3. Step 3. Saucepan — includes — Rice cooker. A rice cooker is an electric pot that switches off when the rice is done.
4. Step 4. Rice cooker — has part — Thermostat. Switching off by temperature.
5. Step 5. Thermostat — is part of — Refrigerator. A thermostat.
6. Step 6. Refrigerator — works like — Heat pump. A heat pump is a refrigerator that heats the house.

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