Padlock and diesel engine: what they have in common

1. Step 1. Padlock — has part — Spring. The mechanism’s springs.
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 — Diesel engine. The diesel turns a generator.

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