Scaffolding and saw: what they have in common

1. Step 1. Scaffolding — has part — Ladder. Ladders between the levels.
2. Step 2. Ladder — uses — Inclined plane. Climbing to a height.
3. Step 3. Inclined plane — works like — Wedge. A wedge is a moving inclined plane.
4. Step 4. Wedge — is used in — Saw. Each tooth of a saw is a small wedge.

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