Maser resonant cavity and car: what they have in common

1. Step 1. Maser resonant cavity — is part of — Maser. A cavity tuned to the transition frequency.
2. Step 2. Maser — evolved into — Laser. A laser is an optical maser.
3. Step 3. Laser — has part — Mirror. A resonator made of mirrors.
4. Step 4. Mirror — includes — Rear-view mirror. A mirror.
5. Step 5. Rear-view mirror — is part of — Car. Mirrors.

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