Moped and oil well: what they have in common

1. Step 1. Moped — has part — Pedal. A moped can be pedalled.
2. Step 2. Pedal — is part of — Michaux velocipede. Pedals.
3. Step 3. Michaux velocipede — is made of — Wrought iron. The frame is wrought iron.
4. Step 4. Wrought iron — is material for — Oil well. The casing pipes are iron.

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