Replaceable blade and truck: what they have in common

1. Step 1. Replaceable blade — is part of — Safety razor. A thin steel blade.
2. Step 2. Safety razor — uses — Wedge. The blade is a wedge.
3. Step 3. Wedge — is used in — Icebreaker. The bow rides up onto the ice and crushes it.
4. Step 4. Icebreaker — has part — Propeller. Propellers.
5. Step 5. Propeller — is part of — Amphibious vehicle. A propeller.
6. Step 6. Amphibious vehicle — evolved from — Truck. A truck chassis.

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