Rail vehicle and router: what they have in common

1. Step 1. Rail vehicle — includes — Steam locomotive. A steam locomotive is a rail machine.
2. Step 2. Steam locomotive — is used in — Postal service. Mail trains.
3. Step 3. Postal service — evolved into — Email. Electronic mail.
4. Step 4. Email — uses — ARPANET. It appeared on ARPANET.
5. Step 5. ARPANET — has part — Router. The IMPs were the first routers.

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