Power socket and payment card: what they have in common

1. Step 1. Power socket — has part — Copper wire. Contacts.
2. Step 2. Copper wire — is part of — Magnetic-core memory. Wires threaded through them.
3. Step 3. Magnetic-core memory — uses — Magnetism. The magnetization of the rings.
4. Step 4. Magnetism — is used in — Payment card. A magnetic stripe.

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