Pottery and aeroplane: what they have in common

1. Step 1. Pottery — evolved into — Saucepan. The first pots were ceramic.
2. Step 2. Saucepan — is made of — Stainless steel. Stainless steel.
3. Step 3. Stainless steel — is material for — Flight recorder. Stainless steel.
4. Step 4. Flight recorder — is part of — Jet airliner. Flight recorders.
5. Step 5. Jet airliner — evolved from — Aeroplane. A jet aircraft.

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