Steel breastplate and elevator: what they have in common

1. Step 1. Steel breastplate — is part of — Plate armour. A breastplate and backplate.
2. Step 2. Plate armour — has part — Rivet. Movable plates on rivets.
3. Step 3. Rivet — is part of — Eiffel Tower. 2.5 million rivets.
4. Step 4. Eiffel Tower — has part — Elevator. Lifts.

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