Assault rifle and electric generator: what they have in common

1. Step 1. Assault rifle — has part — Spring. A return spring.
2. Step 2. Spring — is part of — Bogie. Spring suspension.
3. Step 3. Bogie — is part of — Diesel locomotive. Bogies with wheelsets.
4. Step 4. Diesel locomotive — has part — Electric generator. The generator powers the traction motors.

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