Hand axe and nuclear reactor: what they have in common

1. Step 1. Hand axe — uses — Wedge. The cutting edge of a hand axe works like a wedge.
2. Step 2. Wedge — is used in — Icebreaker. The bow rides up onto the ice and crushes it.
3. Step 3. Icebreaker — includes — Nuclear icebreaker. An icebreaker.
4. Step 4. Nuclear icebreaker — has part — Nuclear reactor. A reactor plant.

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