Insulating column and car: what they have in common

1. Step 1. Insulating column — is part of — Van de Graaff generator. It insulates the dome.
2. Step 2. Van de Graaff generator — is made of — Vulcanized rubber. The belt is rubber.
3. Step 3. Vulcanized rubber — is material for — Windscreen wiper. The blade is rubber.
4. Step 4. Windscreen wiper — is part of — Car. Windscreen wipers.

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