Graphite pencil lead and car: what they have in common

1. Step 1. Graphite pencil lead — is part of — Pencil. A mixture of graphite and clay.
2. Step 2. Pencil — uses — Eraser. Erasing.
3. Step 3. Eraser — is made of — Natural rubber. Rubber.
4. Step 4. Natural rubber — works like — Synthetic rubber. A replacement for natural rubber.
5. Step 5. Synthetic rubber — is material for — Pneumatic tyre. Modern tyres are mostly synthetic rubber.
6. Step 6. Pneumatic tyre — is part of — Car. Car wheels have pneumatic tyres.

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