Hanger hook and nuclear reactor: what they have in common

1. Step 1. Hanger hook — is part of — Clothes hanger. For the barbell.
2. Step 2. Clothes hanger — is made of — Steel. Wire.
3. Step 3. Steel — is material for — Nuclear submarine. The hull is steel.
4. Step 4. Nuclear submarine — has part — Nuclear reactor. A reactor.

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