Exposure meter and rocket: what they have in common

1. Step 1. Exposure meter — has part — Photodiode. A photocell.
2. Step 2. Photodiode — is part of — Infrared seeker. A photodetector.
3. Step 3. Infrared seeker — is part of — Guided missile. A seeker.
4. Step 4. Guided missile — evolved from — Rocket. A rocket with guidance.

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