Wiki and lead–acid battery: what they have in common

1. Step 1. Wiki — uses — World Wide Web. A website.
2. Step 2. World Wide Web — is used in — Search engine. It indexes the web.
3. Step 3. Search engine — uses — Data centre. It runs in data centres.
4. Step 4. Data centre — has part — Uninterruptible power supply. Backup power.
5. Step 5. Uninterruptible power supply — has part — Lead–acid battery. A battery.

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