Pile and parachute: what they have in common

1. Step 1. Pile — is used in — Pile driver. It drives piles.
2. Step 2. Pile driver — has part — Block and tackle. Lifting the weight.
3. Step 3. Block and tackle — has part — Rope. The rope runs around the pulleys.
4. Step 4. Rope — is part of — Parachute. The lines are ropes.

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