Camera and personal computer: what they have in common

1. Step 1. Camera — has part — Photographic flash. A flash.
2. Step 2. Photographic flash — has part — Capacitor. Energy is stored in a capacitor.
3. Step 3. Capacitor — is part of — RAM. A DRAM bit is stored in a tiny capacitor.
4. Step 4. RAM — is part of — Personal computer. RAM.

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