Cleanroom and submarine: what they have in common

1. Step 1. Cleanroom — uses — Air conditioner. Air filtration.
2. Step 2. Air conditioner — is part of — Data centre. Cooling.
3. Step 3. Data centre — has part — Uninterruptible power supply. Backup power.
4. Step 4. Uninterruptible power supply — has part — Lead–acid battery. A battery.
5. Step 5. Lead–acid battery — is part of — Submarine. Underwater, electric motors run on batteries.

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