Sprocket and barrel: what they have in common

1. Step 1. Sprocket — is part of — Bicycle drivetrain. The front and rear sprockets set the gear ratio.
2. Step 2. Bicycle drivetrain — has part — Pedal. The pedals take the force of the legs.
3. Step 3. Pedal — is made of — Iron. Pedals are iron.
4. Step 4. Iron — is material for — Barrel. The staves are bound with iron hoops.

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