Freeze-drying and personal computer: what they have in common

1. Step 1. Freeze-drying — uses — Vacuum. Ice sublimating in a vacuum.
2. Step 2. Vacuum — is used in — Cathode-ray tube. Inside is a vacuum.
3. Step 3. Cathode-ray tube — is part of — Monitor. The first monitors were CRTs.
4. Step 4. Monitor — is part of — Personal computer. A monitor.

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