Parachute pack and cannon: what they have in common

1. Step 1. Parachute pack — is part of — Parachute. The packed canopy and the deployment mechanism.
2. Step 2. Parachute — has part — Rope. The lines are ropes.
3. Step 3. Rope — is part of — Harpoon. A line connects the head to the hunter.
4. Step 4. Harpoon — has part — Wooden shaft. A stick for throwing or striking.
5. Step 5. Wooden shaft — is part of — Hand cannon. A stock that serves as a handle.
6. Step 6. Hand cannon — evolved into — Cannon. A large hand cannon.

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