Crown cap and monitor: what they have in common

1. Step 1. Crown cap — is part of — Glass bottle. A cap.
2. Step 2. Glass bottle — evolved into — Plastic bottle. A replacement for glass.
3. Step 3. Plastic bottle — is made of — Plastic. A plastic bottle is blown from plastic — PET.
4. Step 4. Plastic — is material for — Monitor. The case is plastic.

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