Folding frame hinge and nuclear reactor: what they have in common

1. Step 1. Folding frame hinge — is part of — Folding bicycle. It folds the frame in half.
2. Step 2. Folding bicycle — is a kind of — Bicycle. A bicycle.
3. Step 3. Bicycle — has part — Bike light with dynamo. A lamp.
4. Step 4. Bike light with dynamo — has part — Electric generator. A dynamo.
5. Step 5. Electric generator — is part of — Nuclear power plant. Generators.
6. Step 6. Nuclear power plant — has part — Nuclear reactor. The reactor heats the coolant.

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