Relay and dewar flask: what they have in common

1. Step 1. Relay — has part — Electromagnet. An electromagnet switches the contacts.
2. Step 2. Electromagnet — is part of — Cyclotron. A magnet.
3. Step 3. Cyclotron — uses — Vacuum. Particles fly in a vacuum.
4. Step 4. Vacuum — is used in — Dewar flask. A vacuum.

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