Rear-view mirror and lead–acid battery: what they have in common

1. Step 1. Rear-view mirror — is a kind of — Mirror. A mirror.
2. Step 2. Mirror — is part of — Periscope. Mirrors or prisms.
3. Step 3. Periscope — is part of — Submarine. A periscope.
4. Step 4. Submarine — has part — Lead–acid battery. Underwater, electric motors run on batteries.

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