Maser and car: what they have in common

1. Step 1. Maser — evolved into — Laser. A laser is an optical maser.
2. Step 2. Laser — has part — Mirror. A resonator made of mirrors.
3. Step 3. Mirror — includes — Rear-view mirror. A mirror.
4. Step 4. Rear-view mirror — is part of — Car. Mirrors.

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