ARPANET and watt steam engine: what they have in common

1. Step 1. ARPANET — is used in — Email. It appeared on ARPANET.
2. Step 2. Email — evolved from — Postal service. Electronic mail.
3. Step 3. Postal service — uses — Steam locomotive. Mail trains.
4. Step 4. Steam locomotive — has part — Watt steam engine. A steam locomotive is driven by a steam engine.

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