Pencil and newcomen engine: what they have in common

1. Step 1. Pencil — uses — Eraser. Erasing.
2. Step 2. Eraser — is made of — Natural rubber. Rubber.
3. Step 3. Natural rubber — is material for — Spray bottle. A rubber bulb.
4. Step 4. Spray bottle — has part — Piston pump. A hand pump.
5. Step 5. Piston pump — is part of — Newcomen engine. The beam drove a mine pump.

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