CAD and router: what they have in common

1. Step 1. CAD — evolved from — Sketchpad. Sketchpad was the first CAD system.
2. Step 2. Sketchpad — uses — Cathode-ray tube. A CRT screen.
3. Step 3. Cathode-ray tube — is part of — Television set. A picture tube.
4. Step 4. Television set — has part — Antenna. An antenna.
5. Step 5. Antenna — is part of — Router. Antennas.

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